I've had good success with the "Cell Sensor" for confirming or discounting sources I've sensed with my fingernail magnets. I was surprised to find the Cell Sensor is cheaply made with through-hole components, but hey, it works. I'd love to roll my own. On the other hand, I've had crap results with small fingernail magnets. I'm very glad I prototyped with larger magnets, because the 3mm magnets are way too small to vibrate my whole fingernail.
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