Maybe I also got a lemon. The laser worked, the RPM fluctuated wildly and I only checked 33.3 RPM. I've got insane readings in the 2000rpm range, 300rpm and so on. I checked the batteries with a multimeter and they are fine. Uninstalled and reinstalled several times, nothing. Called Pyle, they said send it in for calibration. too much trouble i give it back
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