Tachometer, RPM Accuracy +/-0.05 Percent, RPM Resolution 1 RPM, Maximum Contact RPM 99,999 RPM, Maximum Non-Contact RPM 99,999 RPM, Minimum Non-Contact RPM 2 RPM, Maximum Non-Contact Distance 1 5/8 ft, Calibration Certificate Type Available Separately, Includes Reflective Tape, Features Last Reading Hold, Min/Max, Digital Display Screen Type LCD, Rotational Speed Measuring Units RPM, Contact Type Non-Contact, Standards CE, Battery Voltage 9V, Manufacturer Warranty Length 2 yr