Digital tachometer, maintenance reminder, replaceable battery, automatic shut-off, suitable for ZTR lawnmowers, tractor generators, marine ATVs, snowmobiles, and equipment.

Hour Meter ---- Contains the tachometer, hour meter, and service counters; helps you track the number of hours you have spent on your engine. The total number of hours can be reset; 0.1 hour accuracySERVICE REMINDER ---- Programmable service timer (SERVICE), countdown service reminder time; when the service time arrives, the service warning icon flashes as a reminderTACHOMETER ---- Accurately records your RPMs while the engine is running, helps set the engine idle speed; can be programmed for different engine starting modesREPLACEABLE BATTERY ---- Replaceable internal CR2450 battery, data retained after battery replacement; when the engine is stopped, the unit automatically shuts off after 2 minutes; Press the button to read the screen; data is retained after shutdown.