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4,394
4.1 out of 5 stars

Bosch GMS120 Digital Multi-Scanner

$68.99
$99.99 31% off Reference Price
Condition: New
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Top positive review
Calidad.
By Manolo Andres on Reviewed in the United States on July 9, 2025
Producto de calidad.
Top critical review
85 people found this helpful
Bosch Really disappointed me!
By Charlavecchio on Reviewed in the United States on May 1, 2012
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.

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