Does what it promises. Saved me a lot of time. Only caveat, it was a somewhat undecided pair of chains. Gave a weak reading between the two interrupters. I didn't understand why, but disabled these schemes and manually confirmed that they were disabled/hosted. Maybe because the wires are routed in the fuse box, or because of some junction boxes I found in this old house... Found strange things I wasn't expecting. For example, the light in the kitchen is on the main switch in the bathroom and in the garage on the same switch as in the second bedroom. I was able to identify and rearrange all of the switches in the box to make room for a new project I'm working on. I don't know how much I will need it in the future but I will remove the battery and put it in my tool box. Overall easy to use, accurate and well thought out. So the key is to test the forks and GFI and the bag feels good. Buy a screw socket adapter and wrap for the old sockets that don't have a ground connection.
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