Setup and safety

Scan, confirm and mark a likely stud

Use a scanner as one clue, then check whether the result repeats. Before starting, read the exact manual, inspect the surface for moisture or irregular texture, and note nearby outlets, switches, trim, plumbing and likely wire routes. A finder that must be held on continuously should not be operated by the edges if its instructions tell you to use a handle.

Build a small map instead of chasing one light

Move slowly across a short area and mark where a signal begins and ends. Scan back across the same area, then scan vertically. A framing member often produces a more coherent band of response than a small patch or inconsistency, but the detector does not prove that the density change is wood. Pipes, wires, a seam, a repair or a shift in material can also change the signal. If the edges move dramatically between passes, do not average the marks and pretend they form a known stud.

Use the right confirmation for the job

For a shelf or mount, repeat the scan at the height where the fastener will go and confirm that the likely member continues above or below. Compare spacing to nearby framing only as a corroborating clue; builders can use doubled, blocked or irregular layouts. If the tool includes a center display, mark the center only after checking both edges. If it offers a live-wire or metal mode, follow that mode's own instructions instead of reading a stud-mode signal as a service map.

Separate a wire warning from a safe-to-drill decision

A live-wire meter may detect only some energized conductors and can be optimized for wires near a stud. No light, tone or negative finder result proves the wall is clear of electricity, plumbing or gas. Before making a hole, shut off relevant utilities and use an appropriate independent service-location method. For critical or uncertain work, obtain a qualified assessment. A stud finder is a layout aid; it is not a safety certification.

Mark, recheck and preserve the limits

Mark both sides lightly, recheck after moving away from an outlet or trim, and use a second position to see if the pattern makes sense. If you cannot reconcile the result with the material or manual, stop. The right next step may be a different tool, access from the other side or professional help. Do not drill deeper just because a printed maximum depth is larger than the estimated finish thickness.

The M210 is an example of how procedure changes interpretation: its manufacturer calls for a held button, fingers kept on the handle and repeated passes to distinguish a stable stud response from sporadic irregularity. See the model review for the exact documented limits.

A requested stud indication and a live-wire meter must coexist on a supported stud arrangement. In current-reference configurations, 30 meet a both-cues-plus-warning request and 43 meet an edge-plus-warning request; the counts do not convert a limited warning into safety clearance. Compare both cues and a warning or edges and a warning together.

A wire warning does not extend a model's surface range. Drywall plus a required warning returns 50 configurations; the lath-and-plaster set is only three conditional Franklin plans, and the broad tile/exterior/metal-mesh group has no reviewed current-reference match. Treat any alert as a limited cue rather than a safety clearance. Keep drywall and a required warning selected together.

When wall, cue, warning and depth are all selected, each must be documented in one compatible plan. Surface compatibility does not fill an unknown depth field, and a deeper center-only mode cannot supply paired edge indications. On drywall with both cue types and a warning, 30 configurations meet 0.7 inches, 21 meet 0.8 inches, and 19 meet 1.5 inches. Compare the same four requirements at 0.7 inches, 0.8 inches or 1.5 inches.

A live-wire meter does not raise a stud-depth ceiling. With a warning required, 39 configurations meet a 1.5-inch minimum and one remains at 1.8 inches: Bosch D-TECT120 in its 60 mm Drywall mode. Compare the depth of the same arrangement that provides the warning, and keep the alert's false-negative limitations in view. Keep the warning and a 1.5-inch minimum together.

Including earlier models adds identified references, not a safety guarantee. The earlier-inclusive live-wire set contains 61 configurations; three Milwaukee 2290 package identities use the same scanner with a limited AC-voltage indicator, while 2291-20 and 2291-21 do not have that documented feature. A recalled or otherwise withheld reference does not become a buying match through the lifecycle choice. Open the earlier-inclusive warning scenario.

None of the CRAFTSMAN models combines edge cues with a live-wire meter: CMHT77633 documents edges but no separate live-AC cue; CMHT77620 and CMHT77621 have separate live-AC warnings but center-only stud cues. Read the edge-only 77633 limit, the center-only 77620 and the center-only 77621; compare the supporting MultiScanner 340, 440, 540, L30, L40, L50 and L70. Keep edges and a warning together in the same finder.

None of the three StudBuddy models documents a live-wire meter. Their magnetic fastener cues are not electrical-service detection, and the Pro's bubble levels and Spot's audible click do not change that distinction. Review the Original, Pro and Spot evidence; keep the required live-wire function selected in the same finder, and do not treat any consumer warning as a safe-to-drill clearance.

The KMM1000 and KMM1000LZ add no match to a required live-wire-meter answer. KMM1000's exact page documents magnetic fastener location but no meter; KMM1000LZ's page directly says it does not distinguish fasteners from live electrical lines, conduit or plumbing. Its laser is layout, not a utility warning. Read the KMM1000 and KMM1000LZ reviews and keep drywall and the required live-wire meter together in the same finder. No warning is proof a wall is safe.

RYOBI ESF5002 adds no result to the 50 current-reference configurations with a documented live-wire meter or warning on a supported stud arrangement: its exact page and model manual document stud signals but no separate live-wire meter. Read the ESF5002 warning-limit assessment rather than treating its broad LED pattern as electrical information. L20's exact sources likewise document no WireWarning meter; L30, L40, L50 and L70 do document it. These are limited alerts for live, unshielded AC, not proof that a wall is free of wiring or safe to drill. Keep the live-wire warning requirement in the finder.

The current-reference live-wire-warning set now includes 50 configurations. CRAFTSMAN CMHT77620 and CMHT77621 pair a center-finding stud plan with a separate, limited AC LED/beep warning; the edge-only CMHT77633 has no separately documented live-AC cue. The center pair's two-inch AC statement is a different target from its stud depth and is not safety clearance. Shielded wiring, conduit, static and wall build can affect the cue. Keep drywall and the warning requirement selected.

Fifty of the 101 current-reference configurations document a limited live-wire meter or warning on a supported stud plan. The StudMark 7310 adds no live-wire-meter match: its exact manufacturer sources describe magnetic fastener location but no separate AC-warning function. See the 7310's documented limits and compare a model with a supported warning plan, such as CRAFTSMAN CMHT77620; neither warning is proof that drilling is safe. Keep the live-wire requirement selected by itself or select it with drywall at the same finder.

When both center-and-edge cues and a live-wire warning are required, the StudMark 7310 matches neither: its magnets locate likely drywall fastener points, while the manufacturer documents no edge/center indicator or AC-warning function. Compare the 7310 source limits with the documented Zircon MultiScanner 540 combination. Keep both cues and the warning requirement selected together.

The StudMark 7310 cannot satisfy a 1.5-inch numeric minimum plus a live-wire warning: no numeric stud depth or separate warning plan is stated in its exact maker sources. Review the model-specific limits and CMHT77621's different mode-specific ceiling; keep both the warning and 1.5-inch threshold selected together.

With earlier models included, STANLEY's S200 manual documents a separate live-AC warning alongside its center-finding plan, but that limited cue is not proof that a wall is clear for drilling. The S200 qualifies only as an earlier reference and does not give the current-reference StudMark 7310 an AC-warning mode; the maker documents no separate live-wire function for the 7310. Read the S200 assessment and 7310 source record, and compare a current expressly documented warning plan such as CRAFTSMAN CMHT77620; keep the two answers together at earlier models plus a required warning.

For dry drywall with both center and edge cues, a required live-wire warning, and even the 0.7-inch minimum, the StudMark 7310 remains excluded: a surface match cannot replace its undocumented depth and signal functions. Compare its magnetic fastener-point method with the documented four-condition alternative, then keep all four conditions selected together.

At a 1.5-inch numeric minimum with a live-wire warning required, the CMHT77621 remains a documented candidate only through its 1.5-inch metal-stud plan; its wood plan reaches one inch, the 77620 only 3/4 inch, and the edge-only 77633 has no documented AC cue. Check the exact model's wood/metal limits and open the same warning-plus-depth finder result.

None of these CRAFTSMAN models combines edge cues with a live-wire meter: CMHT77633 documents edges but no separate live-AC cue; CMHT77620 and CMHT77621 have separate live-AC warnings but center-only stud cues. For both center and edges plus a live-wire meter, none of the three qualifies either. Read the edge-only 77633 limits, the center-only 77620 and the center-only 77621; keep edges and a warning together or keep both cues and the warning together.

Center-and-edge cues plus a required live-wire warning include L70 on shallow StudScan only; its deeper plan is center-oriented, not a paired-edge arrangement. Read the L70 mode distinction and keep both cues and warning together. Edges plus a required warning return 43 current-reference configurations; L30 through L70 qualify on compatible plans, but L20 does not. L30, L40, L50 and L70 explain their distinct shallow/deep limits; preserve the edge and warning conditions.

Drywall plus a required live-wire warning returns 50 current-reference configurations. CRAFTSMAN CMHT77620 and CMHT77621 add separate, limited AC warnings in their center-finding plans; L30's shallow edge plan and L40/L50/L70 mode plans also carry WireWarning, but an indicator cannot certify that a particular location is clear. Compare CMHT77620, CMHT77621, L30, L40, L50 and L70 with the exact drywall-plus-warning finder result.

When drywall, both center-and-edge cues, WireWarning and a 0.7-inch minimum are selected together, 30 configurations remain; L70 qualifies on its shallow StudScan plan. At 0.8 or 1.5 inches, its deep center-only plan fails the separate both-cue condition. Check L70's mode-specific cues and open the exact four-condition 0.7-inch result.

A 1.5-inch minimum plus a required live-wire warning returns 39 plans. CRAFTSMAN CMHT77621 reaches equality on its metal-stud plan, not wood; CMHT77620's stud ceiling is 3/4 inch. Read the 77621 depth distinction, then compare Zircon L40 and L50 at equality on edge-only DeepScan and L70 on center-oriented DeepScan; all warnings remain limited. Open the same warning-plus-depth result.

If a live-wire meter is a required feature

Fifty of the 101 current-reference configurations document a live-wire meter or warning on a supported arrangement. The DW0100 and DW0150 add separate AC LEDs and audible warnings while locating a stud center on drywall; the shared manual cautions that shielding, conduit, dense/metallic layers and static charge affect the signal. The AC indication is not a voltmeter or safe-to-drill clearance. Use the finder with the live-wire warning requirement retained. Drywall plus a required live-wire warning returns 50 configurations. Both DEWALT models contribute supported drywall stud plans; neither alert clears a wall. Keep drywall and the warning requirement together. A 1.5-inch minimum plus a required live-wire warning returns 39 configurations. DW0150 qualifies only through its metal-stud plan, not its one-inch wood-stud plan. Open the exact meter-and-1.5-inch finder scenario.

Fifty of the 101 current-reference models document a live-wire meter or warning on a supported arrangement. MultiScanner 540 and 440 each have limited WireWarning during several modes and a separate active AC Scan; MultiScanner 340 documents WireWarning but has no separate AC Scan. The WM5 sources document no live-wire warning, so it does not qualify when this feature is required. WireWarning and AC Scan are different functions, and neither a positive cue nor its absence clears a wall. Preserve the live-wire requirement in the finder.

When center-and-edge cues and a live-wire warning are both required, 30 configurations remain. MultiScanner 540 adds this combination with its direct edge-center-edge stud cues and limited WireWarning. The 440 and 340 are edge-only; WM5 is edge-only and has no documented warning. This is an indicator fit, not electrical clearance. Keep both cues and the live-wire feature selected.

With edges and a live-wire warning required, 43 configurations remain. MultiScanner 540, 440 and 340 document edge cues and a limited WireWarning in their supported stud arrangements; WM5 has no documented warning. The three MultiScanners' active AC mode distinction remains: 540 and 440 have it, 340 does not. Open the same edge-plus-wire finder condition.

Drywall plus a required live-wire warning returns 50 configurations. The 540 and 440 document limited WireWarning on supported stud modes as well as a separate AC Scan; the 340 has the added warning without a separate AC Scan. WM5 does not document a warning meter. A warning can be missed and is not a map of safe drilling locations. Keep drywall and the wire requirement together.

Drywall, both center-and-edge cues, a live-wire warning and a 0.7-inch minimum leave 30 configurations. MultiScanner 540 meets all four conditions in its shallow 0.75-inch StudScan arrangement; the 440/340 are edge-only, and WM5 has no documented warning. Open the exact four-condition finder result.

At a 0.8-inch minimum, 21 models still meet drywall, both direct cues and the live-wire-warning requirement. MultiScanner 540 transitions to its separate 1.5-inch DeepScan, with the manual-described center/edge sequence and limited WireWarning; the 440 and 340 cannot supply the direct center cue and WM5 lacks the warning. Keep all four answers in the same finder.

At a 1.5-inch minimum on drywall, nineteen configurations retain both center-and-edge cues and WireWarning on a supported plan. MultiScanner 540 qualifies at equality through DeepScan; its maker-stated maximum is not a guaranteed wall result or safety clearance. Open the exact 1.5-inch four-condition finder result.

A 1.5-inch minimum plus a required live-wire warning returns 39 configurations. MultiScanner 540, 440 and 340 qualify at equality through DeepScan, each with limited WireWarning; 540's cue profile differs from the edge-only 440/340. WM5 is shallow and has no documented warning. Keep both the meter and depth conditions together.

Fifty of the 101 current-reference models document an added live-wire meter or warning within a supported stud arrangement. Zircon SuperScan K2 and SuperScan K3 add limited WireWarning alongside their supported stud modes; a warning is not electrical clearance. The W2 and Wood Stud SuperScan also document a limited WireWarning on supported drywall stud arrangements. Each maker gives conditions where a wire may be missed; neither alert clears a wall. Klein's ESF200 adds a separate live-AC warning alongside center/edge LEDs, but its wood-stud ceiling remains 3/4 inch; its 1.5-inch ferrous-metal and 2-inch AC ranges are different targets. The other reviewed Klein electronic models, ESF050, ESF100 and ESF150LL, do not document a dedicated live-wire meter. Nor do the magnetic MSF100 and MSF1002: their specifications say no voltage or live-wire detection, so two magnetic reference points are not an electrical check. The C.H. Hanson 3040 and 3047 pages likewise document no live-wire meter; a battery-free magnet and level are not an electrical warning. The ESF200 manual warns that an AC indication may appear as far as 16 inches from the actual wire and may miss certain wiring; neither a positive nor absent warning clears a wall. Bosch EXPERT D-tect18V-200-17C, GMS 120, D-TECT120, D-TECT200C and GMS120-27 each pair conductor or live-material detection with a drywall wood/stud plan. D-TECT200C documents a 38 mm wood-beam ceiling and Object View edges/center; GMS120-27 documents a qualified 30 mm beam plan with a center cue. Their different moisture, grounding, conductor and mode conditions remain important. None of these is a safety clearance. Use the finder with the live-wire warning requirement retained.

The four DIY 2 and four separate DIY 2 M packages are deliberately outside this option even though their Images views may depict wires: the reviewed M sources do not document a dedicated live-wire meter. A wire image, missing response, or uncertain reading is not an electrical safety check. Compare the exact M base, Essential, Deluxe and Premium package assessments, then preserve the live-wire meter requirement in the finder.

Read the Klein ESF050, ESF200, ESF100 and ESF150LL assessments alongside the Bosch reviews: EXPERT D-tect18V-200-17C, GMS 120, D-TECT120, D-TECT200C and GMS120-27. Open the finder with the live-wire requirement preserved.

Read the exact SuperScan K4, StudSensor 70 and HD900 OneStep limits, then compare the SuperScan ID, A250 and x85's separate-AC limitation. Other exact comparisons: Pro LCD and i65. Open the exact live-wire-warning finder scenario.

Exact model assessments: Pro LCD review · i65 review · M3 review · M4 review · Pro SL review · i520 review · HD900c review · K1 review. Open the exact live-wire-warning finder scenario.

The M155, M210, X2100, X995, A200, A250c, A100, A150, StudSensor Center, HD35, HD55 and HD70 OneStep assessments describe their exact warning evidence and limits. HD35, HD55, HD70 and Center document WireWarning for live unshielded AC under conditions; HD25 does not document this feature. M155 and X995 state 1.5-inch maxima; M210 and X2100 state 1.7 inches; Center, A200, A250c, A100, A150, HD55 and HD70 have separate 1.5-inch DeepScan stud plans. A250c also has a distinct AC Scan mode, while A100 and A150 do not. M50 has a separate lightning-bolt warning optimized for wires near studs, but its manual does not call that a meter; M5, M10, M10S, T6, T9, Basic, both StudScout configurations and the standard StudSensor do not document a live-wire feature. M150 and X990 document a bolt-symbol warning rather than the requested meter cue; M90 is not named in that warning section, and M70/X700 do not document a dedicated detector. The i320 manual describes WireWarning in all modes; the e30 and e50 manuals also describe WireWarning. A positive warning is not a location map, and no alert cannot prove a wall is clear. Keep the warning requirement in the finder.

The Pro35 and Pro45 manuals describe separate WireWarning cues alongside edge-only stud modes; Pro45 adds a 1.5-inch DeepScan stud plan, but Pro35 remains at 0.75 inch. The Pro25 has no documented WireWarning feature. For all three, an absent signal cannot prove wiring is clear.

Drywall plus a required live-wire meter still excludes both Kreg magnetic models: the base KMM1000 has no documented meter, and the LZ manufacturer Q&A says the finder does not differentiate a fastener from live electrical lines, conduit or plumbing. See their basic and LASER-MARK assessments and preserve both conditions in the finder.

Wall material still matters when a meter is present

The two magnetic Klein entries are not wire-meter matches. The MSF100 and MSF1002 explicitly lack voltage and live-wire detection, even though they may locate a ferrous fastener on a drywall plan; their second reference point is not a safety check. Review the MSF100 and MSF1002, and keep both conditions in the drywall-plus-wire finder scenario.

Dry interior drywall plus a required live-wire warning returns 50 current-reference configurations. SuperScan K2 and K3 each document limited WireWarning with a supported drywall stud mode; this is not a safety test. Klein's ESF200 is the only Klein electronic finder here with a dedicated live-AC warning; its 3/4-inch wood-stud figure is separate from the 1.5-inch metal and 2-inch AC readings, and the manual warns that an alert may be offset from the wire. Klein ESF050, ESF100 and ESF150LL do not document a dedicated live-wire meter. Bosch EXPERT D-tect18V-200-17C, GMS 120, D-TECT120, D-TECT200C and GMS120-27 each pair a supported drywall wood/stud arrangement with a manufacturer-documented live-material or live-conductor cue. D-TECT200C combines a 38 mm wood-beam ceiling with Object View edges and center; GMS120-27 combines a qualified 30 mm wood-beam plan with center indication. The D-TECT200C manual cautions about humidity above 50%, conductive layers and some three-phase wiring; GMS120-27 has distinct grounding, humidity and surface limits. These are warnings, not safety clearance. SuperScan K4 and HD900 OneStep document WireWarning with supported stud arrangements; StudSensor 70's instructions give a 110–127 V optimum range. The K4/HD900 deep-mode edge caveats and the 70's center-only high-sensitivity mode remain separate. x85 is excluded because its AC Scan is separate from stud scanning; an absent cue cannot establish a safe location.

Klein ESF200 · EXPERT D-tect18V-200-17C · GMS 120 · D-TECT120 · D-TECT200C · GMS120-27 · K2 · K3 · SuperScan K4 · StudSensor 70 · HD900 OneStep · SuperScan ID · A250 · x85's separate-AC limitation · Pro LCD · i65 · M3 · M4 · Pro SL limitation · i520 · HD900c · K1. Open this exact finder scenario.

The C.H. Hanson 3040 and 3047 do not meet drywall plus a meter: their pages document a magnetic fastener response and rotating level, but no live-wire warning or numeric stud-depth maximum. The exact two-requirement scenario remains at drywall plus live-wire warning.

For lath-and-plaster scanning with a required live-wire meter, the reviewed match set is M210, X2100 and X995; all three require the surface and meter conditions to coexist, and plaster performance remains conditional.

Read the exact M210, X2100 and X995 limitations, including metal mesh, irregular thickness and the X995's lower 1.5-inch ceiling. T6 and T9 have conditional plaster plans and center-and-edge cues but no documented meter. Open the finder with the plaster and meter choices together.

No reviewed current-reference model combines a documented live-wire warning with support for the questionnaire’s broad tile, exterior, metal-mesh or other-difficult-surface grouping. This is a bounded library result, not a claim that no suitable product exists elsewhere. Keep tile/exterior and the required warning selected together in the same finder.

No current-reference model combines a supported plan for the broad tile/exterior/metal-mesh group with a live-wire warning. MultiScanner 540/440/340 add limited WireWarning only on documented stud plans; WM5 has no documented warning meter. Use the exact same-condition finder result to see that empty set.

No reviewed current-reference model combines a documented live-wire warning with support for the questionnaire’s broad tile, exterior, metal-mesh or other-difficult-surface grouping. This bounded library result does not establish that no suitable product exists elsewhere.

The six Klein configurations do not change the empty result: ESF200 documents a live-AC warning only on its documented drywall arrangement, while ESF050, ESF100 and ESF150LL lack a dedicated live-wire meter. The magnetic MSF100 and MSF1002 explicitly say they detect neither voltage nor live wires and do not claim the grouped difficult surfaces. The C.H. Hanson 3040 and 3047 provide neither a live-wire meter nor support for this grouped surface condition. None supports this entire combination. The five Bosch entries also do not document that complete stud plan. EXPERT D-tect18V-200-17C's Object View boundaries do not identify a stud through tile, the GMS 120 metal mode does not convert a lath-nail workaround into stud detection through mesh, and D-TECT120's conductive/metalized-surface warnings are not a general tile/exterior plan. The reviewed SuperScan K4, StudSensor 70 and MultiScanner HD900 OneStep likewise do not cover the full condition; the 70 instructions specifically limit dense glass, tile and foil, and the HD900 manual says not to scan through tile or concrete. Their wire-warning functions are not material support. SuperScan ID and A250 likewise do not document the full grouped arrangement, and x85's AC scan is not a surface mode. Existing warning-bearing models such as M155, M210, X2100, X995, M3/M4, A200/A250c, A100/A150, Center, Pro and HD families, i320, e30 and e50 also fail to document the whole grouped surface; separate alerts cannot substitute for a material-specific stud plan. M3/M4 warn about metal mesh, Pro SL excludes ceramic tile, several StudSensor manuals reject lath-and-plaster, and some warning symbols (M150/X990) are not documented live-wire meters. This empty result applies to the current 101 reviewed configurations only, not the entire market. Keep both requirements in the finder and seek a manual for the actual wall assembly.

Even if earlier products are included, a 1.5-inch minimum plus a live-wire warning excludes both Kreg models: their explicit 0.150-inch fastener-burial ceiling is far below the selected number and neither offers a supported meter plan. The KMM1000 and KMM1000LZ remain current-reference listings when the earlier switch changes, but no feature is inferred from that lifecycle choice. Keep the exact warning-plus-1.5-inch condition in the same finder.

A meter requirement still has its own depth boundary

The 3040 and 3047 also drop out of the depth-plus-meter task for two independent documented reasons: neither maker page supplies a numeric stud-depth maximum, and neither lists a live-wire meter. Keep both filters selected in the meter-and-1.5-inch finder result.

With the live-wire warning required and a 1.5-inch minimum, 39 configurations match. Zircon SuperScan K2 and K3 reach equality in their separate DeepScan stud mode and document limited WireWarning; the K3's separate Metal Scan distances are for metal targets, not stud depth. Bosch GMS 120 reaches equality for wood studs and D-TECT120's Drywall mode clears it at 60 mm; the EXPERT D-tect18V-200-17C falls short because its exact wood-beam figure is 38 mm (about 1.496 inches). The numeric-plus-wire filter does not require a particular edge/center display, so GMS 120's center finder is relevant here even though it is not a both-cue match. SuperScan K4 and HD900 OneStep combine WireWarning with 1.5-inch DeepScan plans but caution that edge visibility may be limited; StudSensor 70 also reaches 1.5 inches in center-only High Sensitivity. Alerts are not safety clearances, and x85's AC Scan is separate from stud scanning.

GMS 120 · D-TECT120 · EXPERT 18V depth limit · K2 · K3 · SuperScan K4 · StudSensor 70 · HD900 OneStep · SuperScan ID · A250 · x85's separate-AC limitation · Pro LCD · i65 · M3 · M4 · HD900c. Open this exact finder scenario.

At a 1.7-inch minimum with a meter required, three plans remain: M210, X2100 and Bosch D-TECT120 in its 60 mm Drywall mode. GMS 120 and EXPERT D-tect18V-200-17C top out below this boundary on their drywall wood-stud/beam plans. M3 and M4's stud plans stop at 1.5 inches, and Pro SL has no documented meter; M155, X995, Pro45, HD55 and the other 1.5-inch meter models also stop short. A live-wire cue is not a safety clearance.

Compare the D-TECT120, GMS 120 and EXPERT 18V scanner with the M210 and X2100 depth and meter evidence. Keep both requirements in the finder.

At 1.8 inches with a live-wire meter required, one reviewed configuration remains: Bosch D-TECT120 Drywall mode at 60 mm (2.36 inches). Franklin MAX Mode 2 has a larger overall numeric claim but no documented live-wire meter; M210 and X2100 top out at 1.7 inches. GMS 120 stops at 1.5 inches and the EXPERT 18V plan at 38 mm (about 1.496 inches). The D-TECT120 result is not a promise of detection through a particular wall, nor a safety clearance.

Compare the D-TECT120's live-conductor caveats with the GMS 120, EXPERT 18V scanner and MAX limits. The M210/X2100 stop at 1.7 inches. This is an empty or sparse result in the current reviewed subset, not a claim about the whole market; see the exact meter-plus-depth finder scenario.

With dry drywall, both center and edge cues, a required live-wire warning and even a 0.7-inch minimum selected together, neither Kreg finder matches: the magnets locate fastener points, Kreg's explicit fastener-depth maximum is 0.150 inch, and a live-wire meter is not documented for KMM1000 or expressly differentiated by KMM1000LZ. Compare each KMM1000 and KMM1000LZ limitation; keep all four original conditions in the same finder.

When drywall, both stud cues, WireWarning and depth all matter

Neither magnetic Klein model can satisfy this joint request: MSF100 and MSF1002 do not detect live wires and neither has electronic center-and-edge signals. Their separate one-inch magnetic scan-depth claim does not carry into a drywall, both-cue and live-warning plan. Compare the single finder and two-unit reference pack; the exact combination remains selected in each 0.7-inch and 0.8-inch finder link.

The C.H. Hanson 3040 and 3047 also fail this interaction: their sources show no electronic center/edge indication, live-wire meter or numeric depth maximum. See their distinct 3040 magnetic-point and 3047 hanger-kit assessments, and keep all four conditions in the same 0.7-inch scenario.

With dry interior drywall, both center-and-edge cues, a required live-wire warning and a 0.7-inch minimum, 30 configurations remain. K2 and K3 join through supported stud modes with both cues and limited WireWarning; the deeper-edge caveat still applies, and K3's Metal Scan is not a stud mode. Klein ESF200 meets all four conditions on its 3/4-inch wood-stud plan and adds a separate live-AC warning; its other metal and AC depth figures do not raise the wood ceiling. Bosch EXPERT D-tect18V-200-17C and D-TECT200C join through 38 mm drywall wood-beam Object View arrangements documenting nearest object edges, a center line/cross and a live-material indication. GMS120-27, the older GMS 120 and D-TECT120 do not meet this pair of stud cues because their reviewed drywall plans are center-oriented rather than edge-marking. SuperScan K4 and HD900 OneStep pair both cues with WireWarning in shallow StudScan; StudSensor 70 also qualifies through its 0.75-inch both-cue plan and limited warning. Its manual gives a 110–127 V optimum range. x85's separate AC Scan is not a concurrent stud-plan meter; alerts are not a safety clearance.

Compare K2, K3, Klein ESF200, EXPERT D-tect18V-200-17C, D-TECT200C, GMS 120, GMS120-27, D-TECT120, SuperScan K4, StudSensor 70, HD900 OneStep, SuperScan ID, A250, x85's separate-AC limitation, i65, M3, M4, i520, HD900c and K1. Open the finder with all four choices preserved.

At the next 0.1-inch step, twenty reviewed models still meet drywall, both center-and-edge cues and the live-wire-warning requirement. K2 and K3 remain through DeepScan with the stated 1.5-inch stud limit and limited WireWarning; edge visibility above 3/4 inch is cautioned. Klein ESF200 drops out because its wood-stud plan is 3/4 inch; ESF100 and ESF150LL lack the requested live-wire meter. Bosch EXPERT D-tect18V-200-17C and D-TECT200C remain through 38 mm wood-beam Object View plans; GMS120-27, the older GMS 120 and D-TECT120 provide live-conductor cues but do not have the documented separate edge cue needed for this combination. SuperScan K4 and HD900 OneStep stay in through DeepScan, although the manuals warn that edge visibility may drop above 3/4 inch; StudSensor 70 drops out because its shallow both-cue plan ends at 0.75 inch and its deeper plan is center-only. SuperScan ID and A250 retain both cues and their warning through separate deeper arrangements; one supported plan must meet every selected condition together.

Compare K2, K3, EXPERT D-tect18V-200-17C, D-TECT200C, GMS 120, GMS120-27, D-TECT120, SuperScan K4, StudSensor 70, HD900 OneStep, SuperScan ID, A250, M3, M4 and HD900c. Open the exact 0.8-inch four-condition finder scenario.

At a 1.5-inch minimum on drywall, 19 reviewed configurations retain both center-and-edge cues and WireWarning in one supported arrangement. The Zircon K2 and K3 join only through DeepScan: both state a 1-1/2-inch stud maximum, center/edge cues and limited WireWarning, while the instructions warn that edges may be hard to see through surfaces thicker than 3/4 inch. K3's distinct Metal Scan has no bearing on this stud-depth boundary. The Bosch EXPERT 18V plan is below 1.5 inches, while GMS 120 and D-TECT120 do not document a separate stud-edge cue. SuperScan K4 and HD900 OneStep meet the selected depth in DeepScan but warn that edges may not remain visible above 3/4 inch; StudSensor 70 is excluded because its 1.5-inch High Sensitivity arrangement gives center-only, not both cues. SuperScan ID and A250 also document both features through 1.5 inches. x85 is excluded because its AC Scan is separate from stud mode. Alerts and depth maxima do not establish a safe drilling location or guaranteed wall reading.

See the Bosch EXPERT 18V depth boundary, GMS 120 cue limitation, D-TECT120 cue limitation, K2, K3, SuperScan K4, StudSensor 70, HD900 OneStep, SuperScan ID, A250, the x85 limitation, M3, M4 and HD900c. Keep all four requirements together in the finder.

When plaster, indication, meter and depth all matter

For lath and plaster, both center-and-edge indications, a required meter and a 1.6-inch threshold, the M210 and X2100 are the two current reviewed matches; i320’s metal-scan lath-fastener function does not override its metal-mesh limitation, and e30/e50 do not support the selected plaster surface; the plaster qualification still applies.

Review the M210 and X2100 surface and meter details. The T9 now meets the depth and indicator portions through its plaster-specific 1.6-inch plan but has no meter; T6 has both indications and conditional plaster support but stops at 1.5 inches and also lacks a meter. Open the finder with all four choices preserved.

At a 1.8-inch threshold, no reviewed model combines the required live-wire warning with a supported lath-and-plaster plan and both indicator cues; Bosch D-TECT120 reaches a deeper drywall threshold but has no documented plaster plan, while Pro35 and Pro45 have warning features but are edge-only and their manuals do not recommend plaster.

Klein ESF200 is the only reviewed Klein model with a dedicated live-AC warning, but it states only 3/4 inch for wood studs and does not support lath and plaster; ESF050 has the same shallow wood limit without a meter, while ESF100 and ESF150LL stop at 1.5 inches and lack the required meter. Neither the magnetic MSF100 nor MSF1002 detects voltage or live wires, and the pads protecting finishes do not create a plaster scan plan. C.H. Hanson 3040 and 3047 add no lath/plaster plan, live-wire meter or depth maximum to this combination. M210 and X2100 have documented warning meters but 1.7-inch maximum claims; X995 has a meter and plaster guidance but its own maximum is 1.5 inches. M155's 1.5-inch maximum is lower and its exact manual does not establish plaster use. M3 and M4 do not provide a supported plaster plan and their instructions say metal mesh can prevent stud detection; Pro SL is not recommended for lath and plaster, has no documented meter and is edge-only. A200 has WireWarning and center/edge cues but its manual says stud detection in lath and plaster is difficult and metal mesh prevents it; A250c has a similar mesh restriction, and both stop at 1.5 inches. A100 and A150 do not recommend plaster. StudSensor Center has a meter and both cues, but its instructions do not recommend plaster; its 1.5-inch DeepScan plan cannot substitute for the selected plaster condition. HD25, HD35, HD55 and HD70 manuals do not recommend plaster, and HD25 also has no WireWarning. The Pro25, Pro35 and Pro45 manuals likewise do not recommend plaster; Pro35 and Pro45 have warning cues but only edge indications, and Pro25 has no documented warning. The standard StudSensor and both StudScout configurations do not document a meter, and StudScout is not a plaster fit. M50's wire warning is not a meter, and M5/M10/M10S have no documented meter; M5 also stops at 1.0 inch, while M10 and M10S have conditional one-inch plaster ceilings and only center cues. T6 and T9 have center-and-edge cues and conditional plaster guidance but no documented meters; T9's plaster figure is 1.6 inches. M150 and X990 carry warning symbols rather than documented meters, while M90 is not named in the warning section and M70/X700 have no documented meter. MAX reaches 2.5 inches overall but has no documented meter; the remaining conditional plaster models with 1.6-inch ceilings also lack meters. The empty result applies to the complete reviewed library, not the entire market. See the exact combined finder result rather than dropping a requirement.

A wall image is not a live-wire meter

The original DIY, DIY Plus and Plus X may depict wires among other wall objects, but the reviewed model evidence does not establish a dedicated live-wire meter for these discontinued scanners. Plus-specific support says it cannot distinguish a wire from a pipe; no visual signal or blank area proves a wall is electrically safe. If you include earlier models while requiring a documented live-wire meter, these three Walabot devices fail that requirement; compare the current Bosch GMS120-27 meter documentation with its own limits, keep both choices in the earlier-inclusive live-wire finder, and follow safe utility-isolation procedures rather than treating an imager as clearance.

Two earlier STANLEY edge sensors with distinct depth ceilings

The exact STHT77403 S100 manual documents edge lights and tone, a 3/4-inch maximum through drywall, and a separate limited 120V AC warning. S150/STHT77404 instead lists selectable 1/2-, 1- and 1-1/2-inch settings, also with edge cues and a limited AC warning; its center is estimated from opposing edge marks. Their wire warnings can miss shielded or conduit wiring and dense or metalized walls, so neither is a safety clearance. Compare the S100 assessment with the S150 assessment, and keep earlier scope, drywall, edge cues, the 0.7-inch boundary and the warning selected together at this same-condition finder. At 1.5 inches, the S100 drops out while the S150's stated maximum reaches equality; neither promises a wall-specific read. Open the 1.5-inch edge-and-warning scenario.

Earlier STANLEY warning cues are model- and mode-specific

STHT77587 and STHT77588 document limited live-AC warnings alongside center-only cues; neither makes a wall safe to drill. The FatMax 400 manual also documents a warning with center-and-edge STUD cues, and a separate wire-only AC TRACKING mode, but CPSC recall 09-185 applies to 77-730 units whose date code does not begin with R. Since this model record has no exact unit date code, the generic 77-730 is withheld from buying matches. STHT77588 has the better documented metal-stud range than 77587, but that distinction does not expand its live-wire warning. The exact FatMax 400 recall/reference review, 77587 and 77588 assessments describe the cue limits; 77587/77588 rely on official reader text and have no exact local image. Keep the same earlier-inclusive warning requirement selected, and independently isolate/verify utilities before drilling.

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