I've an old Black & Decker one. It works, though I'm not always confident about the results and always breathe a sigh of relief when the hole is drilled and I'm not electrocuted or water spurts out. I was particularly pleased at our old house when I managed to trace an electrical cable that defied logic and ran diagonally up a wall.
Not sure about this, but I suspect that they may be thrown by metal foil that backs plasterboard that is used these days.
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