MULTI-FUNCTION HOUR METER—-Contains tachometer, hour meter, service timers, job timer;Help you manage your health engine.HOUR METER—-Help you track how many hours you put on your engine.When engine is off, display shows total run time of engine and remains visible.TOT hours are non-resettable; 0.1 hours accuracyMAINTENANCE REMINDER—-Programmable maintenance interval service timer(SVC),Countdown tracking service reminder time;JOB timer used to measure the time of a particular work job, Like change oil, Air filter Replacement etc…TACHOMETER—-Accurately records your RPMs when the engine is running , Help adjust engine idle;Can be programmed for different engine firing patterns.Programmable RPM Alert , Red backlight display and warning icon flashes,;Recording and recall engine MAX RPMOTHER —-Easy to install; Contains detailed instructions for use; Multi-Color Backlit Display , Battery replaceable, User shutdown; Data retained after shutdown;Waterproof rating: IP67;Two working s