The device is not easy to use at first. But the good thing is that you can mark panels and find chains very quickly. No more flipping switches. Also, it can tell you if the outlet is part of the circuit or not, so you don't have to disassemble what isn't. can also find the path of pipelines. So you can get your feet wet when you learn how to use it. comes with cables to help with troubleshooting etc. The only downside is that both devices have 4 AA batteries and you need to unplug them as soon as possible or the batteries will die. There is an auto shut off but it could be 5 or 10 minutes or something like that.
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