I was totally skeptical about this work at first but to my surprise it really works. We had issues with some of the electrical work we were doing and found that much of the wiring was not only incorrect but also posed a major fire hazard. What was really handy about this reader is that I didn't have to knock down any walls to get this reader to work. This reader comes with batteries so it was ready to use right out of the box. I tested this on my phone and it automatically read the volts put out by my phone. I then tested it on a bluetooth speaker and it showed up again. That's when I tried it on my wall and automatically the tension started to rise higher than it should be. Even when used almost all day, it has never destroyed the included batteries, so no battery life is wasted. Really comfortable to hold in hand and weighs a little. But more importantly, it really works.
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