Runleader is proud to present the new RL-HM022 Digital Mini Gasoline Tach/Hour meter. It can work on most any 2 or 4 stroke gas engine. It has a powerful timing system, RPM measuring system, as well as some other unique function design. Timing System Including: accumulating total running hours TOT, etc. RPM Measuring System Including: easuring current engine RPM,recording engine MAX RPM,refresh rate can be set 0.5S or 1S,etc. Unique Design Including: easy installation, waterproof Rate IP68,etc.