Protmex MS6208B 50-250mm Non-contact Measurement Digital Tachometer With 100 Groups Data Logging, Data Hold, Max/Min/AVG, Backlight The MS6208B is a contact-type digital tachometer with stable performance, high reliability and high safety performance. The core component of the meter is a compact high-speed integrated chip. The meter will display rotation speeds from 50RPM---99999RPM. The LCD is backlit to allow making and reading measurements in low light conditions. Functions: 50-99999RPM Non-Contact Measurement, 50mm-250mm Measuring Distance, Auto Power Off, MAX/MIN/AVG Functions, m/min m/sec ft/min ft/Sec in/min unit selection, 100 groups Data Logging