Review on 📈 Pyle PST43: Reliable Non-Contact Tachometer with Enhanced Protective Features by John Hall

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