... LCD Tachometer EMT260B Digital Optical Tachometer DetailsFunction:Maximum, minimum and last measurement of rotational speed, frequency, cycle, linear speed and counter. ... 1666.6Hz Cycle: 0.6~60000ms Counter: 1~99999 Linear speed: 0.1~3000.0m/min 0.0017~16.666m ... body• Contact tip assembly• Contact tip (concave and convex)• Linear contact wheel• Operation manual• Carrying case Digital Optical Tachometer