The REED  R7100 portable contact/noncontact tachometer measures up to 99,999rpm, has a laser beam for noncontact measurements, and a five-digit LCD screen. This contact/noncontact portable tachometer is used for measuring the speed of motors, conveyor belts, and other moving and rotational systems. It measures rotational speed from 10 to 99,999rpm for noncontact measurements, and from 0.5 to 19,999rpm for contact measurements, with + or - 0.05% accuracy. It is autoranging, to display the most appropriate test result value automatically. It measures surface speed from 0.5 to 1,999.9m/min. Its optical sensor is a laser beam that works at a distance from 50 to 500mm for user safety. The LCD screen presents test results and the unit of measurement, and it stores the maximum, minimum, and last test result values for ease of data recall. It comes with a cone contact adapter, a funnel contact adapter, a surface speed wheel, four AA batteries, reflective tape, instructions, and a carrying case. This tachometer is suitable for measuring rotational speed and other measurements in mechanical or industrial engineering environments. This product includes a calibration certficate traceable to NIST (National Institute of Standards and Technology).