The Shimpo PT121 Contact Tachometer is a simple to use, ergonomic, rugged test instrument for rotational speed applications. This velocity analyzing and measuring device is ideal for rotational machine inspection and process speed analysis. The PT-121 possesses a large backlit LCD screen that provides clear viewing in any environment. With a simple selection switch users can obtain readings in either RPM, meters, meters per minute in metric models or RPM, feet and feet per minute in imperial models. During testing, the unit automatically saves maximum, minimum, last recorded values and up to 96 logged data readings. The compact, lightweight PT121 Tachometer comes standard with 3 AAA batteries, protective carrying case, plus several contact adapters and contact wheel.