1、Hour meter (Tot) function, help you track how many hours you put on your engine. 2、Service timers (Svc) function, countdown tracking time, reminding maintenance, such as air filter replacement. 3、Jobs timer function, used to measure the time of a particular work _x000D_ _x000D_ Jobs, such as change oil. 4、Tachometer function, display reads engine current Rpm Value, help to adjust engine idle. 5、Very suitable for car engines operating in the 25,000 + Rpm range. 6、Can be used with any 2-stroke or 4-stroke gas engine. 7、With 0 hour reset function, the hour meter can read up to 10000 hours, and then reset to 0, the tachometer can read up to 99.999 Rpm. 8、Programmable maintenance time settings with service icons to remind when to change oil or other services. 9、Using a wrap-around black wire around the spark plugs wire, you can work on all spark ignition engines by selecting the engine type using the S1 and S2 buttons. 10、Splashed-proof, durable to use, and easy to install, no complicated tools required.