Tachometer, RPM Accuracy +/-0.02 Percent of Reading +/-1 Digit, RPM Resolution 1 RPM, Maximum Contact RPM 19,999 RPM, Minimum Contact RPM 1 RPM, Maximum Non-Contact RPM 99,999 RPM, Minimum Non-Contact RPM 1 RPM, Maximum Non-Contact Distance 12 in, Minimum Non-Contact Distance 4 in, Calibration Certificate Type Available Separately, Maximum Velocity Measured 1,999 m/min, Minimum Velocity Measured 0.32 fpm, Includes Carrying Case, Reflective Tapes Batteries