Bosch Professional detector with direction indicator and control buttons.
Bosch Professional detector with color-coded marking hole, easy-to-use user interface and display, ergonomic grip, Jobsite tough construction, and power flexibility.
Bosch Professional stud finder with a case, and two AA batteries.
Bosch Professional detector held by a hand on a white wall, above a grey wall with a copper pipe, cable, wood, and rebar.
Person kneeling, using a red pencil to mark a wall while holding a blue tool.
A person using a Bosch Professional detection device on a tiled wall, with a shower and sealant visible.
Bosch Professional wall scanner held by person.
A person of African descent wearing a yellow hard hat and a safety vest, holding a Bosch Professional wall scanner against a concrete wall.
Bosch GMS120-27, with the battery compartment open, revealing the battery slots and the cover with "OPEN" text. The device has warning text, a circular feature, and is held by a person.
Bosch Blaze Lithium-Ion battery, GBA37V10, 1.0Ah, 3.7V, compatible with GLL50-20, GLL50-20G, GLM165-22, GLM165-25G, GLM165-27C, GLM165-27CG, and GMS120-27.
Bosch Measuring & Layout Tools, LIMITED WARRANTY, 1 YEAR + 1 YEAR when you register. Register within 8 weeks for 2 years coverage.
Bosch Professional detector with direction indicator and control buttons.
Bosch Professional detector with color-coded marking hole, easy-to-use user interface and display, ergonomic grip, Jobsite tough construction, and power flexibility.
Bosch Professional stud finder with a case, and two AA batteries.
Bosch Professional detector held by a hand on a white wall, above a grey wall with a copper pipe, cable, wood, and rebar.
Person kneeling, using a red pencil to mark a wall while holding a blue tool.
A person using a Bosch Professional detection device on a tiled wall, with a shower and sealant visible.
Bosch Professional wall scanner held by person.
A person of African descent wearing a yellow hard hat and a safety vest, holding a Bosch Professional wall scanner against a concrete wall.
Bosch GMS120-27, with the battery compartment open, revealing the battery slots and the cover with "OPEN" text. The device has warning text, a circular feature, and is held by a person.
Bosch Blaze Lithium-Ion battery, GBA37V10, 1.0Ah, 3.7V, compatible with GLL50-20, GLL50-20G, GLM165-22, GLM165-25G, GLM165-27C, GLM165-27CG, and GMS120-27.
Bosch Measuring & Layout Tools, LIMITED WARRANTY, 1 YEAR + 1 YEAR when you register. Register within 8 weeks for 2 years coverage.

GMS120-27 Professional

Wall/Floor Scanners

Wall Scanner

  • Quick, easy detection – helps detect live wires, metals and wood and steel studs behind drywall
  • Clear detection results – with color-coded marking hole, center indication and LEDs for material identification
  • Stud finding – locates wood and steel studs behind drywall with center identification for more precise detection
  • Jobsite tough construction – with IP54 rating and shock-absorbing rubber casing
  • Power flexibility – works with included AA batteries or 3.7V Li-ion battery (sold separately) for less downtime on the job
  • Bosch measuring and layout tools are covered by a one year limited warranty with an additional year when you register your tool within eight weeks of purchase - for details, visit https://rb-pt.io/PowerToolWarranty or call 1-877-BOSCH99
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Functions & key features

Measuring tools positive icon for web: Live Wire Detection
Measuring tools positive icon for web: Metal Detection
Measuring tools positive icon for web: Wood Detection
Measuring tools positive icon for web: IP 54 Rating
Measuring tools positive icon for web: 2xAA Power Flexibility
GMS120-27 Professional

Technical data

The most important data

Height in
1.3 "
IP Rating
IP 54
Length in
7.32 "
Max Detection Depth Copper Wiring
Up to 2-in
Max Detection Depth Ferrous Metals (Steel)
4" (100mm)
Max Detection Depth Non-Ferrous Metals (Copper)
Up to 4-3/4-in (12 cm)
Operating Temperature
14° F / -10° C ~1 22° F / 50° C
Weight
0.64 lb
Width in
3.4 "
Includes
(1) GMS120-27 Wall Scanner
(2) AA Batteries
(1) Soft Pouch

GMS120-27 Professional: Further information

Product Highlights

The Bosch GMS120-27 Wall Scanner provides quick, easy, and accurate detection of wood and steel studs, metals, and live wires behind drywall. Power flexibility helps keep the scanner up and running on the job with the option to use with the included two AA Batteries or 3.7V Li-Ion battery (sold separately). Get clear, confident results with the intuitive user interface that displays object center indication and material identification. Easy to use, the device glides smoothly across the wall and the color-coded illuminated marking ring makes fast, accurate work of transferring detection results. IP54 rating and shock-absorbing rubber casing help provide added durability on tough jobsites.