Amprobe TACH-10 Tachometer with Contact and Non-Contact Measurement Combination contact and non-contact measurements for measuring rotational speed of motors, conveyor belts, and other moving and rotational systems Contact measurements in RPM, m/min, ft./min, or yd./min and non-contact measurement in RPM for flexibility of use Measurements accurate to + or - 0.1% LCD display measures 15 x 33mm (0.6 x 1.3 inches) for readability Non-contact measurements using infrared beam function at a distance of 5 to 30cm (2 to 13 inches) User selectable units for contact measurement: RPM, m/min,-Feet/min, yd/min Non-contact measurement in RPM Measures rotational and surface speed Easy to select units and mode functions Digital display