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Bosch GMS120 Digital Multi-Scanner with Modes for Wood, Metal, and Live Wiring

4.1 4.1 out of 5 stars 4,023 ratings
Amazon's Choice highlights highly rated, well-priced products available to ship immediately.
Amazon's Choice in Stud Finders & Scanners by BOSCH

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Multi-Scanner

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About this item

  • Detection: The Bosch GMS120 Digital Wall Scanner features multi-mode laser detection for wood studs, metal objects (rebar, studs and steel/copper pipes) and live wiring
  • Performance: Features the latest 3 sensor laser technology, offering a wide range of detection performance of up to 4 3/4 inches deep in cured concrete, up to 2 inches for live wiring, up to 3 1/8 inches for copper and up to 1 1/2 inches for wood studs; The accuracy of the product is 0.0625
  • Self calibrating: Includes 3 selection modes for wood, metal, and AC wiring; The GMS120 offers automatic calibration from the start and continues to self calibrate through the course of the project for easy and precise detection
  • Display: Features an illuminated graphical LCD display to indicate mode, detection strength, and more; The large detection ring flashes green for no object found, orange for object near and red for object found within the sensor range
  • Center Finder: This wall scanner includes a center finder that pinpoints the object center with an audible detection signal with an on/off button
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Customer ratings by feature

Easy to use
3.7 3.7
Easy to read
3.5 3.5
Value for money
3.5 3.5
Accuracy
3.2 3.2

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From the manufacturer

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MULTI-MODE DETECTION

For detection of wood studs, metal objects (rebar, studs and steel/copper pipes), or live wiring.

ILLUMINATED RING INDICATES DETECTION STATUS

Flashes green (no object found) / orange (object near) / red (object found within the detectable sensor area).

AUTOMATIC CENTER FINDER

For locating center of detected wood or metal object.

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ILLUMINATED GRAPHICAL DISPLAY

Indicates mode, detection strength and more.

THREE SELECTION MODES (WOOD, METAL, AC WIRING)

With automatic calibration for easy and precise detection.

DEEP METAL DETECTION CAPABILITY

Detects steel up to 4-3/4 In. deep in cured concrete.

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AUDIBLE DETECTION SIGNAL

With on/off button.

ERGONOMIC SOFT-GRIP

For secure grip and comfort.

INCLUDED CONTENTS

Wall Scanner, hand strap, (1) 9V battery and pouch.

Product information

Technical Details

Additional Information

Warranty & Support

Amazon.com Return Policy:Amazon.com Voluntary 30-Day Return Guarantee: You can return many items you have purchased within 30 days following delivery of the item to you. Our Voluntary 30-Day Return Guarantee does not affect your legal right of withdrawal in any way. You can find out more about the exceptions and conditions here.
Product Warranty: For warranty information about this product, please click here

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Bosch

Bosch GMS120 Digital Multi-Scanner with Modes for Wood, Metal, and Live Wiring


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Product Description

Product Description

The BOSCH line of countersinks are great for deburring and chamfering openings to pre-drilled holes. Great for electrical, plumbing and HVAC contractors. BOSCH countersinks cut varied materials cleanly and accurately. With standard high-speed steel and super hard titanium-coated bits, these countersinks perform great in even the toughest materials.

Amazon.com

Bosch’s GMS120 digital multi-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, carpenters, masons, plumbers, and others who need reliable detection.

GMS120 Digital
Multi-Scanner
At a Glance:

  • Three available modes: wood, metal, wiring

  • Automatic calibration, automatic center finder

  • Detect steel at up to 4-3/4-inches deep in concrete

  • Illuminated display for mode, detection strength, and more

  • Audible detection signal with an on/off button

Bosch’s GMS120 digital multi-scanner has three detection modes and a bright LCD display
(
view larger.) Consistent Material Coverage
With its three modes, Bosch’s GMS120 digital multi-scanner is an aid in most situations, as its modes cover wood studs, metal objects such as rebar, studs, and steel/copper pipes, and live wiring. It has precise automatic calibration that makes use easier and an automatic center finder, which pinpoints the center spot of the wood or material that has been detected.

Deep Detection
The GMS120 has a deep metal detection feature, which allows a user to detect steel that is placed up to 4-3/4-inches (120 mm) deep in cured concrete. It has a maximum detection depth of up to 2 inches for live wiring, up to 3-1/8 inches for copper, and up to 1-1/2 inches for wood studs.

User-Friendly Features
Bosch’s GMS120 digital multi-scanner provides an illuminated ring that indicates detection status and an audible detection signal with an on/off button. Adding to the user-focused design, its bright and readable illuminated graphical LCD display indicates mode, detection strength, and more, making it simple to check the detection device and switch modes and tasks. In addition, its ergonomic soft-grip provides a comfortable grip that’s secure and safe.

Dimensions and Warranty
The Bosch GMS120 digital multi-scanner measures 10-1/4 inches by 3 inches by 6-1/2 inches and weighs .6 pounds. It comes with a two-year warranty.

What's in the Box
One Bosch GMS120 digital multi-scanner, hand strap, one 9-volt battery, and carrying pouch.

Bosch’s GMS120 digital multi-scanner detects multiple materials, has a user-friendly design, and easy detection status checking (click each to enlarge).

Important information

Wattage

0 watts

Bulb Voltage

9 volts

Customer reviews

4.1 out of 5 stars
4.1 out of 5
4,023 global ratings

Customers say

Customers have different opinions on the performance and accuracy of the tools.

AI-generated from the text of customer reviews

235 customers mention162 positive73 negative

Customers are mixed about the performance of the tool. Some mention that it works great in perfect conditions, while others say that it does not work well and that the fancy features don't even work that great. Some say that the tool works okay on interior walls, while other say that is does not works at all on electrical wiring and that it doesn't work thru plywood.

"...Using it around the house, I find it works better in the thick walls and wood paneling, especially for finding live wires...." Read more

"...If you need to find all three things, this unit is excellent." Read more

"...Worse yet, the current sensing function seems to be entirely non-functional...." Read more

"...These are not obvious and increase the utility of the tool, which I found to be accurate...." Read more

151 customers mention53 positive98 negative

Customers are mixed about the accuracy of the tool. Some mention that it is much more accurate and consistent than their old one, while others say that it gave them numerous false readings and was inconsistent.

"...down a star for general failure to detect wiring but its scan range for wiring is limited as stated." Read more

"...It also does a good job of finding electrical wires...." Read more

"...The indicated center of the stud is often not repeatable, so it takes a number of back-and-forth scans to get a good feel for where I should be..." Read more

"...Pretty much making the indicators useless because you couldn't rely either to indicate when you actually moved over a stud...." Read more

This easy-to-use stud/metal/wire finder is great
5 Stars
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.
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Top reviews from the United States

Reviewed in the United States on November 12, 2019
Style: Multi-ScannerVerified Purchase
Customer image
5.0 out of 5 stars This easy-to-use stud/metal/wire finder is great
Reviewed in the United States on November 12, 2019
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.
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14 people found this helpful
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Reviewed in the United States on December 9, 2023
Style: Multi-ScannerVerified Purchase
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Reviewed in the United States on January 4, 2021
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Reviewed in the United States on February 17, 2024
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Top reviews from other countries

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M. Tomasovich
5.0 out of 5 stars Muito útil.
Reviewed in Brazil on March 8, 2024
Style: Multi-ScannerVerified Purchase
Rocail
5.0 out of 5 stars Recommande
Reviewed in Canada on March 3, 2024
Style: Multi-ScannerVerified Purchase
Analí Corrales
5.0 out of 5 stars Buena calidad
Reviewed in Mexico on August 16, 2021
Style: Multi-ScannerVerified Purchase
One person found this helpful
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muhammad saifullah
5.0 out of 5 stars awesome
Reviewed in Singapore on July 7, 2023
Style: Multi-ScannerVerified Purchase
grant d
5.0 out of 5 stars works very well
Reviewed in Australia on July 22, 2021
Style: Multi-ScannerVerified Purchase