Tachometer, RPM Accuracy +/-0.04 Percent, Maximum Non-Contact RPM 99,999 RPM, Minimum Non-Contact RPM 10 RPM, Maximum Non-Contact Distance 3/4 ft, Calibration Certificate Type NIST, Maximum Velocity Measured 6,562 fpm, Minimum Velocity Measured 0.16 fpm, Includes Reflective Tape, USB Interface Cable, Features Computer Interface, Measures Counts, Digital Display Screen Type LCD, Rotational Speed Measuring Units RPM, Contact Type Non-Contact, Standards CE, Number of Digits 2 WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov -