I really like this wall sensor. I've been using the screw and hammer method for years because most wall gauges are a joke. I put the included 9v battery in this device, it calibrated itself and found the pins in a matter of seconds. I started installing the barn door but had to stop because the latches didn't catch the bolt. Now I can finish hanging it. I found and marked the centers of the lugs, checked the area with a screw and am right in the center of the lug. I've spent hours looking for a good product, read a lot of reviews, and this product has the best reviews. I'm glad I chose it. It works great and is easy to use. I definitely recommend it to everyone. This is a great tool and is well made and has lasted longer than any I have used in the past. I have included two photos so you can see how easy it is to read and how accurate they are. The first table shows dead center and I was able to verify this by looking under the table to make sure it was centered on the support brace.
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