The Electronic Specialties Small Engine Tach/Hour Meter, No. 329, is a multi-function instrument capable of displaying stable/unstable engine RPM readings up to 20,000 as well as the engine run-time in hours. The dust and waterproof tool can be used for engine tuning and service or it can be mounted on the vehicle using the included Velcro strips and two-sided tape.There are two choices for the display update rate: twice per second or once per second. The meter has three hour-meter modes built-in. These modes can be used to track engine run-time, engine service intervals or job working time. The unit comes with a one-year warranty.