Specifications Special Features:Inductive Tachometer Gauge Alert RPM Engine Hour Meter Backlit Resett Item Weight:86g Item Height:1.8cm Item Width:3.5cm Item Length:6.8cm Origin:Mainland China Material:ABS Self Powered Engine Digital Maintenance Reminder Tachometer contains tachometer, hour meter, service timers, job timer , Programmable max RPM reminder and backlit mode selection. Replaceable battery ,Shutdown function and waterproof design. There is a Russian manual, if you need it, please tell me your email, I will send it to you. MULTI-FUNCTION HOUR METER Include Tachometer(RPM),Hour Meter,Service Timers(SVC&SVC2), Resettable Job Timer(JOB);Convenient to view the data,help to manage your healthy engine. HOUR METER Help to track how many hours you put on the engine;When engine is off, display shows total run time of engine and remains visible;TOT hours are non-resettable with 0.1 hours accuracy;Allows user to preset initial total hours to replace the old meter. MAINTENANCE REMINDER Programmable maintenance interval service timer(SVC&SVC2),countdown tracking service reminder time;When SVC times reached,the warning icon will be flashed and backlight turned to red;JOB timer used to measure the time of a particular work job, such as change oil,Air filter replacement etc,the value can be reset; JOB and SVC readings can be viwed directly by related buttons. TACHOMETER Record your RPM value accurately when engine is running, help to adjust engine idle;Different engine firing patterns can be programmed;Programmable RPM Alert,Red backlight display and warning icon flashes;Recording and recall engine MAX RPM; Programmable RPM measurement range selection mode for improved RPM data accuracy. OTHER Easy to install;Contains detailed instructions for use; Green Backlit Display ,Programmable backlit mode;Battery replaceable, User shutdown;Data retained after shutdown;Waterproof rate: IP65;CE ROHS certification;2-years warranty.