It works very well - I know because I have new spikes next to the old ones and it finds the new ones louder and clearer, and then the old ones a few inches away with a little more shimmer. I don't think he'll find power though - he signaled some, probably missed others. Also, this is for dummies like me - keep it vertical, not horizontal. I don't know why I did it. The directions were pretty bad, but maybe they indicated that someone with common sense was working with it. Walk slowly and don't lean your hand against the wall.
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