Manufacturer | Bosch |
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Part Number | GMS 120 |
Item Weight | 1.1 pounds |
Product Dimensions | 9.84 x 5.91 x 1.97 inches |
Item model number | GMS 120 |
Batteries | 1 9V batteries required. (included) |
Is Discontinued By Manufacturer | No |
Size | Pack of 1 |
Color | Blue |
Style | Multi-Scanner |
Material | metal |
Power Source | Battery Powered |
Voltage | 9 Volts |
Item Package Quantity | 1 |
Measurement System | Metric |
Included Components | Unit^Instruction Guide |
Batteries Included? | Yes |
Batteries Required? | Yes |
Battery Cell Type | Alkaline |
Warranty Description | Bosch measuring and layout tools are covered by a one year limited warranty with an additional year when you register your tool within eight weeks of purchase - for details, call 1-877-BOSCH99 |
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Bosch GMS120 Digital Multi-Scanner with Modes for Wood, Metal, and Live Wiring
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Purchase options and add-ons
Media Type | No Media |
Scanner Type | Wall |
Brand | BOSCH |
Model Name | GMS120 |
Connectivity Technology | No Connectivity |
Product Dimensions | 6.5"D x 10.25"W x 3"H |
Resolution | 600 |
Item Weight | 0.5 Kilograms |
Optical Sensor Technology | CMOS |
Minimum System Requirements | No System Requirements |
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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From the manufacturer
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MULTI-MODE DETECTIONFor detection of wood studs, metal objects (rebar, studs and steel/copper pipes), or live wiring. |
ILLUMINATED RING INDICATES DETECTION STATUSFlashes green (no object found) / orange (object near) / red (object found within the detectable sensor area). |
AUTOMATIC CENTER FINDERFor locating center of detected wood or metal object. |
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ILLUMINATED GRAPHICAL DISPLAYIndicates mode, detection strength and more. |
THREE SELECTION MODES (WOOD, METAL, AC WIRING)With automatic calibration for easy and precise detection. |
DEEP METAL DETECTION CAPABILITYDetects steel up to 4-3/4 In. deep in cured concrete. |
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AUDIBLE DETECTION SIGNALWith on/off button. |
ERGONOMIC SOFT-GRIPFor secure grip and comfort. |
INCLUDED CONTENTSWall Scanner, hand strap, (1) 9V battery and pouch. |
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Bosch GMS120 Wall Scanner Product Review
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Product information
Technical Details
Additional Information
ASIN | B004TACMZ8 |
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Customer Reviews |
4.1 out of 5 stars |
Best Sellers Rank | #7,979 in Tools & Home Improvement (See Top 100 in Tools & Home Improvement) #14 in Stud Finders & Scanners |
Date First Available | April 5, 2011 |
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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).
From the Manufacturer
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.
Important information
0 watts
9 volts
Customer reviews
Customer Reviews, including Product Star Ratings help customers to learn more about the product and decide whether it is the right product for them.
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AI-generated from the text of customer reviews
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
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
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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.
Reviewed in the United States on November 12, 2019
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.
That said, I compared the GMS120 to the Zircon HD900c (available only at Home Depot from what I can tell) and ultimately decided to keep the Zircon unit. The Zircon offered slightly superior functionality but it was really ease-of-use that motivated my choice. One key feature difference is that the Zircon unit scans for studs in two different modes: normal and Deep Scan. The theory is that you don't necessarily want the scanner to find something deeper in the wall (pex, etc.) and have it misidentify it as a stud so the normal mode scans only to 3/4 of an inch. Deep Scan scans to 1.5 inches. The Deep Scan mode is useful with double layers of sheetrock or when you're looking for an empty cavity instead of a stud. The Bosch unit only has one stud finder mode that seems equivalent to Zircon's Deep Scan as it goes to 1.5 inches.
The Zircon unit identifies what it is seeing by the color of the LCD backlight on its display as well as text or symbols on the display itself. I thought the colored backlight was a gimmick until I tried it. I found it very convenient. Bosch uses a colored LED surrounding a hole in the middle of the scanner to convey the same information but, for me, this didn't work nearly as well. As other reviewers have noted, the LED is so bright that you have to turn on the display's backlight to even read it. And the hole in which you are supposed to insert a marking instrument becomes pitch black, making it difficult to see what you are doing. The Zircon makes it much easier to make a precise mark, projecting a red arrow onto the surface where it believes the center of an underlying object to be.
The bottom line is that I consider the GMS120 to be a good tool that can be quite useful. However, I do think that Zircon HD900c is a better choice at about the same price.
Unfortunately, life is more complicated than that. The Bosch unit worked in my 140-year-old home with a variety of lathe and plaster walls, lots of pipes, and different types of electrical wiring. It wasn't perfect every time. Sometimes it was an inch or half an inch off. However, that was easy to correct by drilling some 1/16" pilot holes to confirm the precise location of the stud.
It also does a good job of finding electrical wires. Older homes often have a variety of electrical wiring schemes that were installed over the decades. I had no trouble finding the wires I was looking for.