Bosch GMS120 Digital Wall Scanner

Model: bshngms120
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Bosch GMS120 Digital Wall Scanner Model: bshngms120

Product Features & specs :

Bosch GMS120 Digital Wall Scanner

Bosch's GMS120 Digital Wall Scanner provides detection of multiple materials including wood, metal and live wiring. Because of its versatility and consistent performance, it's an ideal tool for construction, electricians, contractors, masons, plumbers and others who need reliable detection.
  • Multi-mode detection for wood studs, metal objects (rebar, studs and steel/copper pipes) and live wiring
  • Illuminated graphical LCD display indicates mode, detection strength and more
  • Deep metal detection capability detects steel up to 4-3/4 in. deep in cured concrete
  • Automatic center finder for locating center of detected wood or metal object
  • Automatic calibration for easy and precise detection with 3 selection modes (wood, metal, AC wiring)
  • Audible detection signal with On/Off button
  • Ergonomic soft-grip for secure grip and comfort
  • Illuminated ring indicates detection status
What’s Included:
  • Digital Wall Scanner - GMS120
  • Hand Strap
  • 9V Battery
  • Carrying Bag
3.75 in.
7.75 in.
1.4 in.
1.7 lbs.
Audio Alert
Batteries Included
Battery Type
Bluetooth Compatibility
Case Included
Case Type
Charger Included
Detects Metal
Detects Voltage
Digital Display
Laser Level Included
Max. Detection Depth (Copper Wiring)
2 in
Max. Detection Depth (Ferrous Metals)
4-3/4 in
Max. Detection Depth (Non-Ferrous Metals)
3-1/8 in
Max. Detection Depth (Wood)
1-1/2 in
Max. Wall Thickness
4.75 in
Motor Type
Operating Temperature (F)
14 - 22 Degrees F
Power Source
Wifi compatibility

Reviews :

3.9 / 5.0
51 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Would you recommend this product?
Yes (32)
No (6)
Lightweight (22)
Ergonomic Design (15)
Easy To Use (4)
Value (3)
Heavy (2)
Not Durable (1)
Uncomfortable to Use (1)
Best Uses
Large Projects (4)
Small Projects (3)
Home Repair (3)
Jobsite (2)
Not Good
Should have read these reviews 1st. Used the scanner to find studs under tile in order to install grab bars for my elderly mom. Consistently was off and drilled into dry wall - not a wooden stud.
December 3, 2019
Originally posted at
Good tool
This easy-to-use stud/metal/wire finder is great, Quality good.
November 22, 2019
Originally posted at
GMS-120 Could Be Better
My expectations were high, after all this is a Bosch product. Studs were found but it took a few repetitions. I like that you can mark through the tool with a pencil. It is most important to move slowly, at a constant motion and flat to the wall. My walls are textured and this was somewhat difficult. I did not think that the display was bright enough and hard to read unless you were in front of the screen.
October 9, 2019
Originally posted at
Straight Trash!!!
I have had this "dud" finder for a year now and it does nothing but give false readings for everything, can barely can find a stud, and cannot be trusted. I cannot express my disappointment wasting the money that I did for this piece of junk. All the other Bosch product I own are great but this stud finder is furiously disappointing!
September 7, 2019
Originally posted at
Just doesnt work
I was feeling confident after ten or so passes at every interval that the marks would at least hit wood if not the center. Nope several inches off on one side or another for four out of five studs.
July 26, 2019
Originally posted at
Using it
So far so good. Lighting helps in dark spaces like under a counter.
February 22, 2019
Originally posted at
Makes Walls Invisible
I used my Bosch GMS 120 for the first time during my garage organization project. My outside walls are concrete or stucco, inside and ceiling are dry wall. The hurricane resistant construction uses a combination of steel and wood studs. The versatility and accuracy of the GMS 120 made my project a breeze.
October 7, 2018
Originally posted at
useless junk
I bought this unit last week. It's going BACK to the store. Mostly missed the beams and wires. Drill holes in the walls ALL missed the beams 8 drill holes missed the beams. Sorry Bosch but it's an expensive piece of junk.
July 18, 2018
Originally posted at
A lot of false reading
Its giving a lot of false reading, I am not using it any more
January 22, 2018
Originally posted at
Works better than standard stud finders
I've had this for a year now and used in several situations. It takes a bit to get used to, AKA read the directions. But works better than standard stud finders I've used in the past.
August 17, 2017
Originally posted at

Q & A :

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Browse 7 questions Browse 7 questions and 6 answers
Will the GMS120 identify metal in the hollow space of a CMU cell?
Stated differently, the metal is in the hollow core of a concrete block wall, the metal is not in contact with concrete.
Thank you.
MICHAEL M on Sep 23, 2017
BEST ANSWER: Yes, the GMS120 is capable of metal detection up to 4-3/4 in. deep in cured concrete
Will this scanner detect wood studs behind marble tile? I'm guessing between the tile, thinnest and cement board, I have roughly 1" of material to scan through.
Mike on Jul 18, 2016
BEST ANSWER: Your question would be best answered by Bosch direct. Please contact them at 877-267-2499
Can this be used to detect a cast-iron stack behind drywall? If so, I'll be buying.
Chris on Nov 6, 2015
BEST ANSWER: This unit can detect wood,metal, and live wiring through drywall.
Can the Digital wall scanner(gms120) find wood studs in an insulated wall or ceiling? If it can I'll be buying.
Retired on Aug 23, 2015
BEST ANSWER: Yes, the GMS120 can find wood studs in an insulated wall or ceiling
How well can it detect studs in an insulated wall?
Pete on Aug 18, 2015
BEST ANSWER: This will find studs in up to 4" of concrete, so it should work well with insulated walls.
Was wondering if you ever sell this reconditioned wall scanner with the case
Mike on Jan 12, 2015

Unfortunately, with reconditioned tools, it's uncertain whether or not the cases would be included.
Can this detect studs, on walls with foil backed insilation? My current detector is fooled constantly by the foil.
fudney on Jun 9, 2017