Amazon.com: DIGITEN 4 Digital Green LED Tachometer RPM Speed Meter + Hall Proximity Switch Magnet Sensor NPN for Lathe Conveyor Belt : Industrial & Scientific
Amazon.com: DIGITEN 4 Digital Red LED Tachometer RPM Speed Meter + Hall Proximity Switch Magnet Sensor NPN for Lathe Conveyor Belt : Industrial & Scientific
Replacement RPM Sensor – Stainless – Computech
Monarch 6180-056 Optical Sensor, for up to 3 feet. Range from 1 to 250,000 rpm from Cole-Parmer