![]() I covered up the window while I was doing the scanning to ensure I didn’t “cheat”. I cut that little window so the accuracy of the GMS120 would be easy to see. To test out the GMS120, I setup a sheet of 1/2″ drywall and anchored a 2×4 stud, live wire (extension cord) and a segment of copper pipe behind it. The light ring, audio signal and display indicate the results, and you can mark the wall through the marking hole. ![]() Next, you slide the tool over the surface to be scanned. ![]() The best measurements are achieved by selecting the appropriate mode. To operate the GMS120, you press the red power button and select between Wood, Metal and AC Wiring mode. Plus, the wall scanner can operate over drywall, cured concrete, and plaster and lathe. The GMS120 is a wall scanner that can locate wood studs, metal studs, copper pipe, PEX tubing filled with water, rebar, live wires (110-230v) and more. Here’s a link to the Lowe’s site where you can see all the product details. Our GMS120 came to us courtesy of Lowe’s, and you can find it in-stores and online for $79.98. Although this tool came out early last year, it’s a new addition to the OPC workshop, and I’ve rigged up a test for the GMS120. Well Bosch is working to change all that, and today we’re taking a look at the GMS120 Wall Scanner. I’m sure you’ve been there too, driving a screw through sheetrock only to find there’s nothing behind it. I’ve often felt like studs finders are the snake oil of home improvement, and I could do just as well knocking on the drywall to find a stud.
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