Shimpo DT-207LR Handheld Tachometer with 6" Wheel, LED Display, 6 - 99999rpm Range Contact/noncontact portable tachometer with a six-inch wheel for measuring the speed of motors, conveyor belts, and other moving and rotational systems Measures rotational speed, linear speed, and total length for flexibility of use Takes noncontact measurements using a laser beam that works at a distance from 1 inch to 20 feet for user safety Five-digit LED screen presents test results and the unit of measurement Conforms to NIST standards for compliance with regulations, and CE mark indicates compliance with applicable EU directives