Hign-concerned Chemical:NONESpecial Features:Inductive Tachometer Gauge Alert RPM Engine Hour Meter Backlit ResettItem Diameter:3.5cmItem Weight:86gItem Height:1.8cmItem Width:3.5cmItem Length:6.8cmExternal Testing Certification:ceModel Name:RL-HM032BBrand Name:FoundownOrigin:Mainland ChinaMaterial:ABSFucntions:RPM,Hour Meter,Service Timers(SVC&SVC2), Resettable Job Timer(JOB)RPM range:0~25000RPMRPM refresh rate:0.5s/1.0sRPM accuracy:10 RPMSVC range:0~1000HSVC group:SVC/SVC2JOB range:0~99999HJOB group:JOBFiring partterns:1P1R 1P2R 2P1R 3P1R 3P2R 4P1R 5P2R 6P1R 8P1RWaterproof rate:IP65Other functions:Battery replaceable, User shutdown;Data retained after shutdownBacklight:green, redRL-HM032B 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.