Tachometer, RPM Accuracy +/-0.01 Percent, RPM Resolution 0.001 RPM, Maximum Non-Contact RPM 99,999 RPM, Minimum Non-Contact RPM 5 RPM, Calibration Certificate Type NIST, Includes 12 in Reflective Tape, Features Operating Distance upto 36 in, Digital Display Screen Type LCD, Rotational Speed Measuring Units RPM, Contact Type Non-Contact, Standards CE, IEC1010-1, Minimum Operating Temperature 40 Degrees F, Maximum Operating Temperature 105 Degrees F, Battery Voltage 1.5V, Number of Digits 5