I've used this in places where there are known spikes and it works about 75-80% of the time. This is a lot better than my old method of driving studs into the bottom of the wall and filling the holes with putty (luckily my walls are white). I'm not entirely sure why he sometimes misses one. Maybe the error is in my calibration. But when he picks them up, he defines the edges and the middle well. The outer shell looks and feels cheap. The first time I put the battery in, the battery cover broke and I have to tape it off with a strip of tape. I like the ad. Very easy to read and informative. I'm reasonably happy and will use it, but there is room for improvement. Mostly a problem with the latch and the inability to see the accidental bolt. I also wish it ran on a couple of AA batteries instead of the more expensive 9 volt ones. I can't expect a Mercedes for this price.
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