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I've had false positives (when moving the detector around where no wires were present) but never a false negative. Will keep an eye out for this. Then again, I use it almost exclusively to ensure that, yes, I really did flip the correct breaker. And our house is small, has very simple wiring. (A good thing, too, as with my bad leg I'm not able easily to crawl around in the crawlspace and unfinished attic. Simple and easy = comparatively quick, yay.)
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