VISUAL ALERTS - Stay informed with an illuminated ring that changes color based on detection status.
AUDIBLE FEEDBACK - Get instant alerts with an optional audible detection signal for enhanced usability.
CENTER FINDER MAGIC - Effortlessly find the center of studs and pipes with the automatic center finder.
PRECISION DETECTION - Easily locate wood, metal, and live wiring with advanced multi-mode technology.
USER FRIENDLY DISPLAY - Navigate detection modes and strength with a clear, illuminated graphical display.
The BOSCH GMS 120 Wall Scanner is a versatile tool designed for professionals and DIY enthusiasts alike. It detects wood, metal, and live wiring with precision, featuring an illuminated status ring and an automatic center finder for easy use. With a user-friendly display and optional audible alerts, this scanner ensures you never miss a beat in your projects.
Specifications
Item Weight
0.5 Kilograms
Item Dimensions D x W x H
6.5"D x 10.25"W x 3"H
Minimum System Requirements
No System Requirements
Optical Sensor Technology
CMOS
Light Source Type
LED
Connection Type
No Connectivity
Resolution
600
Supported Media Type
No Media
Scanner Type
Wall
Have a Question? See What Others Asked
Does the GMS120 detects water pipers hidden in concrete?
Does anybody know if the Bosch GMS 120 is exactly the same as the one sold in Germany. I need it to detect power supply lines (230V) and water lines in brick walls 50mm deep. Anybody has any info if these are made specifically for the US market?
Does it scan through stucco?
Can it scan through bathroom tile
Reviews
4.1
All from verified purchases
A**R
Excelente
Very handy. Excelent quality. Precise and easy to use.
S**E
This easy-to-use stud/metal/wire finder is great
I use it for the thick drywall/plaster or wood floors in my house and works much better than the cheaper electronic ones I have used in the past. Most of my 1950s home's walls have drywall coated in plaster and are about 1" thick is most spots so non-electronic and electronic stud finders never worked too well. Remodeled areas of my home also have the standard 5/8" or 1/2" thick drywall and 3/4" thick wood paneling which I use this mostly successfully on. I also used this successfully to detect flood joists beneath wood flooring, copper and galvanized pipes behind cement board/tile and to find rebar in cement. It can detect steel as deep as 4.75" in the wall, wood up to 1.5" and wires up to 2".Using it around the house, I find it works better in the thick walls and wood paneling, especially for finding live wires. In the standard thickness drywalled walls, it does not find electrical wires well but it does find studs and plumbing well. The only downside to this detector is I cannot get it to consistently find electric wires behind 1/2" or 5/8" drywall which is standard on most homes. In most cases, it will not detect them at all but does give a reading sometimes. This is probably due to the finder only being able to detect wires up to 2" deep in the wall. Sometimes wires are not within 2" of the drywall surface. It also cannot detect studs well behind wood paneling which is not surprising.I find it pretty user-friendly, just turn it on, set your mode (wood, metal, electrical) then place it on the wall and give it a second to calibrate. Afterwards, start searching. It will alert you to whatever mode you have it set on with a bar gauge. When you have it on wood mode, it will also alert you to metal and wires which is convenient. It makes noises as you get closer (you can turn the sound off, it is a bit irritating). When you find the center of a stud, pipe or wire, the finder has a convenient holes you can stick a pencil through the mark it. It seems to find wood with the assistance of finding screws/nails and overall, I find its best to scan up and down to find the exact position of the stud, pipe or wire. You probably wont get the exact location on the first bullseye. The finder also has a backlight for the screen when using in dark areas.The finder comes with a 9v battery, carrying case and directions as well. The directions take a little reading. Overall, this is great for finding studs and pipes but 4/5 stars for the general inability to find electrical behind standard thickness drywall. 5 stars for versatility and ease of use. I thought about knocking it down a star for general failure to detect wiring but its scan range for wiring is limited as stated.
J**E
Great birthday present for those cutting into your walls without knowing what's behind them
expensive, but good value, actually works as advertised, makes quick work of locating pipes, conduit, studs too
G**F
Good scanner, but fiddly
I bought this because of the great ratings and reviews here and elsewhere. But I found this tool very fiddly. It has problems with our walls and find electricity and studs where they are not. I have had much more better luck with a cheap stud finder.However, when this tool does read properly, it is very handy, because the target is perfect for centering a mark.Perhaps our walls just have some weird stuff behind them (and it wouldn’t surprise me after what we have seen.
C**O
Bosch Really disappointed me!
Wow! I pity the poor fool trying to make a living using this thing. I own 3 other stud finders and decided to go for, what I perceived to be, the best. I have purchased plenty of fine Bosch tools so I arrived at the conclusion that all of the individuals rating this stud finder so low just didn't know how to use it. Later I would reveal to myself that this was indeed a pompous conclusion.Then I bought one. My background is in Electrical Engineering so I do know a thing or two about how these devices work. I decided to put the Bosch Scanner to the test. First, I scanned a section of wall with three studs on 16 inch centers sheeted with standard 1/2 inch dry wall.This was a relatively simple task as the bays were clear of any pipes, wire or insulation. I used a $15 Zircon, a $25 Zircon and a $20 Stanley to map the area. As expected, all three found the studs accurately. I had been using these 3 units for years and trusted all for this type of scan. I marked the studs on a strip of painters tape about 6 feet long to document the results.Then I attempted to settle the Bosch unit down and let it self calibrate over a known empty bay. The Green Ring lit up and I thought this is sweet! That was it for the excitement. As I moved the unit across the tape the blasted thing beeped and showed center about every 3-4 inches. I tried everything above and below the tape marked with the other stud finder's results.Other Notes:The readability of the LCD display is ridiculous! This one had to be held about 20 degrees above eye level to see anything. Ah, but I thought, If I turn it upside down I will not have to squat to get readings below neck high. I could see it alright, but it was still incorrect and really cumbersome to use upside down.I cannot imagine how Bosch let this thing get on the market. Maybe this was a LEMON but if it was: There are most assuredly too many lemons produced with this model.By the way, the electrical wire sensor never did work even with a loaded circuit of 100 Watts. The metal finder did find the drywall nails, but so can my $1.25 swivel magnet nail finder. I have no embedded ferrous or nonferrous metal pipes in my walls, so to be fair; I could not test this function.
Common Questions
Trustpilot
TrustScore 4.5 | 7,300+ reviews
Ravi S.
I loved the variety of products available. Will definitely shop again.
2 months ago
Sneha T.
Received my product in pristine condition. Great service overall.
Bosch GMS 120 professional multi material cable detector, complete with protective bag. The most convenient multi-functional scanner for construction applications. Includes: hand strap, (1) 9-Volt battery and carrying case.
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Excelent quality. Precise and easy to use."},{"@type":"Review","reviewRating":{"@type":"Rating","ratingValue":"5.0"},"author":{"@type":"Person","name":"S***E"},"datePublished":"November 12, 2019","name":"This easy-to-use stud/metal/wire finder is great","reviewBody":"I use it for the thick drywall/plaster or wood floors in my house and works much better than the cheaper electronic ones I have used in the past. Most of my 1950s home's walls have drywall coated in plaster and are about 1\" thick is most spots so non-electronic and electronic stud finders never worked too well. Remodeled areas of my home also have the standard 5/8\" or 1/2\" thick drywall and 3/4\" thick wood paneling which I use this mostly successfully on. I also used this successfully to detect flood joists beneath wood flooring, copper and galvanized pipes behind cement board/tile and to find rebar in cement. It can detect steel as deep as 4.75\" in the wall, wood up to 1.5\" and wires up to 2\".Using it around the house, I find it works better in the thick walls and wood paneling, especially for finding live wires. In the standard thickness drywalled walls, it does not find electrical wires well but it does find studs and plumbing well. The only downside to this detector is I cannot get it to consistently find electric wires behind 1/2\" or 5/8\" drywall which is standard on most homes. In most cases, it will not detect them at all but does give a reading sometimes. This is probably due to the finder only being able to detect wires up to 2\" deep in the wall. Sometimes wires are not within 2\" of the drywall surface. It also cannot detect studs well behind wood paneling which is not surprising.I find it pretty user-friendly, just turn it on, set your mode (wood, metal, electrical) then place it on the wall and give it a second to calibrate. Afterwards, start searching. It will alert you to whatever mode you have it set on with a bar gauge. When you have it on wood mode, it will also alert you to metal and wires which is convenient. It makes noises as you get closer (you can turn the sound off, it is a bit irritating). When you find the center of a stud, pipe or wire, the finder has a convenient holes you can stick a pencil through the mark it. It seems to find wood with the assistance of finding screws/nails and overall, I find its best to scan up and down to find the exact position of the stud, pipe or wire. You probably wont get the exact location on the first bullseye. The finder also has a backlight for the screen when using in dark areas.The finder comes with a 9v battery, carrying case and directions as well. The directions take a little reading. Overall, this is great for finding studs and pipes but 4/5 stars for the general inability to find electrical behind standard thickness drywall. 5 stars for versatility and ease of use. I thought about knocking it down a star for general failure to detect wiring but its scan range for wiring is limited as stated."},{"@type":"Review","reviewRating":{"@type":"Rating","ratingValue":"4.0"},"author":{"@type":"Person","name":"J***E"},"datePublished":"April 25, 2025","name":"Great birthday present for those cutting into your walls without knowing what's behind them","reviewBody":"expensive, but good value, actually works as advertised, makes quick work of locating pipes, conduit, studs too"},{"@type":"Review","reviewRating":{"@type":"Rating","ratingValue":"5.0"},"author":{"@type":"Person","name":"G***F"},"datePublished":"December 15, 2024","name":"Good scanner, but fiddly","reviewBody":"I bought this because of the great ratings and reviews here and elsewhere. But I found this tool very fiddly. It has problems with our walls and find electricity and studs where they are not. I have had much more better luck with a cheap stud finder.However, when this tool does read properly, it is very handy, because the target is perfect for centering a mark.Perhaps our walls just have some weird stuff behind them (and it wouldn’t surprise me after what we have seen."},{"@type":"Review","reviewRating":{"@type":"Rating","ratingValue":"1.0"},"author":{"@type":"Person","name":"C***O"},"datePublished":"May 1, 2012","name":"Bosch Really disappointed me!","reviewBody":"Wow! I pity the poor fool trying to make a living using this thing. I own 3 other stud finders and decided to go for, what I perceived to be, the best. I have purchased plenty of fine Bosch tools so I arrived at the conclusion that all of the individuals rating this stud finder so low just didn't know how to use it. Later I would reveal to myself that this was indeed a pompous conclusion.Then I bought one. My background is in Electrical Engineering so I do know a thing or two about how these devices work. I decided to put the Bosch Scanner to the test. First, I scanned a section of wall with three studs on 16 inch centers sheeted with standard 1/2 inch dry wall.This was a relatively simple task as the bays were clear of any pipes, wire or insulation. I used a $15 Zircon, a $25 Zircon and a $20 Stanley to map the area. As expected, all three found the studs accurately. I had been using these 3 units for years and trusted all for this type of scan. I marked the studs on a strip of painters tape about 6 feet long to document the results.Then I attempted to settle the Bosch unit down and let it self calibrate over a known empty bay. The Green Ring lit up and I thought this is sweet! That was it for the excitement. As I moved the unit across the tape the blasted thing beeped and showed center about every 3-4 inches. I tried everything above and below the tape marked with the other stud finder's results.Other Notes:The readability of the LCD display is ridiculous! This one had to be held about 20 degrees above eye level to see anything. Ah, but I thought, If I turn it upside down I will not have to squat to get readings below neck high. I could see it alright, but it was still incorrect and really cumbersome to use upside down.I cannot imagine how Bosch let this thing get on the market. Maybe this was a LEMON but if it was: There are most assuredly too many lemons produced with this model.By the way, the electrical wire sensor never did work even with a loaded circuit of 100 Watts. The metal finder did find the drywall nails, but so can my $1.25 swivel magnet nail finder. I have no embedded ferrous or nonferrous metal pipes in my walls, so to be fair; I could not test this function."}],"aggregateRating":{"@type":"AggregateRating","ratingValue":4,"bestRating":5,"ratingCount":5}},{"@type":"FAQPage","mainEntity":[{"@type":"Question","name":"Does the GMS120 detects water pipers hidden in concrete?","acceptedAnswer":{"@type":"Answer","text":"Thank you for your question. The GMS120 will not detect plastic pipes. However, the D-tect 120 will detect plastic pipes up to 2 3/8\" deep. http://www.amazon.com/Bosch-D-TECT-120-Detection-Scanner/dp/B00SWIHA1E If you have further questions please feel free to contact our Bosch Customer Service Representatives at 1-877-BOSCH-99 (1-877-267-2499)"}},{"@type":"Question","name":"Does anybody know if the Bosch GMS 120 is exactly the same as the one sold in Germany. I need it to detect power supply lines (230V) and water lines in brick walls 50mm deep. Anybody has any info if these are made specifically for the US market?","acceptedAnswer":{"@type":"Answer","text":"The answer is provided by the manual at http://www.bosch-professional.com/gb/en/gms-120-23317-ocs-p/which specifies:Digital Detector GMS 120Article number 3 601 K81 0..Maximum scanning depth*- Ferrous metals - 120mm- Non-ferrous metals (copper) - 80mm- Live conductors 110-230 V - 50mm(voltage applied)**- Wood - 38mmRegards,Mikhail"}},{"@type":"Question","name":"Does it scan through stucco?","acceptedAnswer":{"@type":"Answer","text":"Yes the GMS120 can scan through stucco. This is the coolest scanner I have ever owned. It seems like something out of Star Trek. I really like the LED display and the Bosch scanner has a nice hole in the middle so one can precisely mark the center location with a pencil."}},{"@type":"Question","name":"Can it scan through bathroom tile","acceptedAnswer":{"@type":"Answer","text":"The GMS120 Wall Scanner can scan through bathroom tile. It is designed to find magnetic and non-magnetic metals, power cables, wooden substructures or even plastic pipes with maximum reliability and precision. It has 3 selection modes (wood, metal, AC wiring) - with automatic calibration for easy and precise detection. For further assistance, contact us at 1-877-BOSCH99 (1-877-267-2499) from Mon-Fri 7A-7P CST."}}]}]}
