Precise contact measurement. Auto power off (with disable). Jumbo display, 5 digit LCD. Memory min/max/last. 2.3 to 6,560 RPM. Contact: 0.5 to 1.999 RPM. Contact range: 10 to 99,999 RPM. Surface speed: 3 to 30,000 ft/min. Resolution: 0.001; 0.01; 0.1; 1 RPM. Sampling: 1 sec. (greater than 60 rpm). Includes battery, spare wheels, and hard case.