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Model#: BSHNGMS120

What are the different product conditions?

Brand new items;Full manufacturer warranty available
Manufacturer inspected, repaired and tested items; CPO 120 day money back guarantee
Open Box
New or Recon 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 $64.99
Recon $49.99
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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


    4.2 / 5.0
    41 Reviews
    5 Stars
    4 Stars
    3 Stars
    2 Stars
    1 Star
    Yes, I would recommend this to a friend (27)
    No, I would not recommend this to a friend (4)
    Lightweight (20)
    Ergonomic Design (14)
    Heavy (1)
    Best Uses
    Large Projects (2)
    Small Projects (1)
    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
    Yes, I would recommend this to a friend
    Best Uses
    Large Projects
    Very handy. Very good sensitivity.Works OK on lath a plaster
    Works on lath & Plaster walls. Senses most wires and pipes.
    May 17, 2016
    Yes, I would recommend this to a friend
    Best Uses
    Large Projects
    Good product !
    I love it. Works great
    May 10, 2016
    Yes, I would recommend this to a friend
    Ergonomic Design
    It is a tool worth having it
    The device is well built easy to read display and it is simple to operate. I am a beginner I found it easy to use this device. I thinks every one who wants to avoid making extra holes on their Walla should have one.
    September 8, 2015
    Yes, I would recommend this to a friend
    good on metal stud and wood but electric wires ...
    it detects metal stud and 2x4 perfectly right on the center but when it comes to live wires it gets nothing it doesn't detect a thing at all. little bit bulky design as well compared to other detecter. what i like is the hole at the top to mark ur center .
    September 8, 2015

    Questions & Answers

    Start typing your question and we'll check if it was already asked and answered. Learn More
    Browse 9 questions Browse 9 questions and 9 answers
    Can I determine if the studs are metal or wood behind drywall?
    William on Nov 13, 2013
    BEST ANSWER: This scanner can detect wood studs, metal objects (rebar, studs and steel/copper pipes) and live wiring. Also, the scanner can detect the type of material found.
    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.
    Do you ship to Australia ? And how much for the shipping cost ?


    DL on Oct 7, 2013
    BEST ANSWER: Currently we do not ship to Australia.

    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: $64.99 $49.99
    You Save: N/A $15.00 (23%)