Model#: BSHNGMS120

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Brand new items;Full manufacturer warranty available
Manufacturer inspected, repaired and tested items; CPO 120 day money back guarantee
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New items with possible minor cosmetic damage; CPO 120 day money back guarantee
Returned items inspected, repaired and tested by CPO technicians; CPO 60 day money back guarantee

Bosch GMS120 Digital Wall Scanner

New $72.99
Recon $54.99
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Product Overview


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
  • Digital Wall Scanner - GMS120
  • Hand Strap
  • 9V Battery
  • Carrying Bag


Cordless: Yes
Battery Type: Alkaline
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.
Operating Temperature (F): 14 - 122 Degrees
Voltage: 9V


  • Detection
  • Recommendations


    4.0 / 5.0
    47 Reviews
    5 Stars
    4 Stars
    3 Stars
    2 Stars
    1 Star
    Yes, I would recommend this to a friend (32)
    No, I would not recommend this to a friend (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)
    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
    Exceeded My Expectations
    The GMS 120 helped me get a complicated job done where my regular unit did not.
    July 19, 2017
    Originally posted at
    i bought this product a year ago used once then put in toolbox now doesnt want to read anything but just beeps as if theres live wires.
    June 3, 2017
    Originally posted at
    Great precision
    I just bought this stud finder today and it is the very first stud finder to actually find the rafters in my ceiling. I have tried quite a few others and always had to hunt for the stud. This one did exactly what it said. Good job Bosch.
    January 20, 2017
    Originally posted at
    Yes, I would recommend this to a friend
    Best Uses
    Small Projects
    Bosch reputation is excellent. Great product
    Had many other stud finders , but this is the most accurate
    August 21, 2016

    Questions & Answers

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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
    BEST ANSWER: Hi Mike,

    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

    New Vs. Reconditioned

    What's the difference between New and Factory-Reconditioned?

    Factory-Reconditioned products have been returned to the manufacturer and are restored to like-new operating condition; they go through a rigorous testing and inspection process. Plus, they offer a significant savings vs. new.
    • Reconditioned products may have minor cosmetic blemishes or scratches that do not affect item performance.
    • Reconditioned products may not come with all of the consumables the new version comes with (bits, sanding pads/papers, cases, etc.).
    • Both come with a manufacturer warranty and are covered by our Money Back Guarantee; New is 30 days, Reconditioned is 120 days.
    Condition: New Factory Reconditioned
    Features: Same Same
    Specs: Same Same
    Includes: Digital Wall Scanner - GMS120,
    Hand Strap,
    9V Battery,
    Carrying Bag
    Digital Wall Scanner - GMS120-RT
    Availability: In Stock In Stock
    Warranty: 2 Year Limited 1 Year Limited
    Price: $72.99 $54.99
    You Save: N/A $18.00 (25%)