Optical tachometer calibration The RPMC 1700 Series is high precision Tachometer calibrator, generates true reference rotation per minute (RPM). This calibrator uses “German technology” with high speed motor, high precision encoder and adoption of a new power full 32 bit CPU in control drive, featuring automated gain tuning function, stability, stable stop, rugged in use and many more. Due to it’s light weight and rugged Aluminium enclosure, it is suitable for in-house and on-site calibration of contact / non contact Tachometer, Tacho coil, Tacho generator, RPM indicator, RPM transmitter, Speedo meter, Proximity sensor, Stroboscope, etc., .