Handheld Digital Laser Photo Tachometer RPM Tach Small Engine Motor Speed Gauge Handheld Laser Tachometer for measurement of RPM revolutions per minute Measurement Range: 2.5 to 99999 RPM Resolution: 0.1 RPM from 2.5 to 999.9 RPM, 1 RPM over 1,000 RPM Accuracy: +/- 0.05% +1 digit; Memory: Max / Min RPM Large Display, uses 9V Battery (included), Manual and Carrying Bag