JOB timer reading displays from 0 to 99,999 Hours. In addition, we are also committed to creating simple and practical day timers, night light, hygrometers and other products to add fun and security to our life. Jayron JR-HM032A Cuentarrevoluciones Digital Autoalimentado/Inductivo/Mantenimiento/Apagado 3 JOB timer (JOB) Function Used to measure the time of a specific job, such as changing the oil. TOT hours cannot be reset,JOB timer for measuring specific working time; resettable. But automatic clearing when exceeding the maximum value 99999 H. ; Maintenance interval service timer (SVC& SVC2 ) RPM METER ---- Messuring and records your RPMs (0-20000RPM) when the engine is running; Recording and recall engine MAX RPM; RPM alert warning; GREEN & RED BACKLIGHTS DISPLAY ---- Green backligh mode: always-on, OFF and automatical; Red backlight will display to remind the RPM exceed warning. JOB timer can be reset. When the engine is turned off, the total running time of the engine will be displayed and remain visible. BACKLIGHT----This product has two colors of backlight: red and green. Programmable maintenance interval time from 0-200H. PRODUCT FUNCTION 1 Hour Meter (TOT) Function When the engine is off, the display shows the total running time of the engine and remains visible. TOT hours are non-resettable. The total hours max value is 99999 H(Accuracy:0., 1 H/1 H). Has 8 different Programmable firing patterns. 2 Service timers (SVC) Function Countdown tracking time, Reminding maintenance,Such as Air filter Replacement. Jayron Digital LCD Inductive Hour Meter Hourmeter Waterproof For Marine Boat SnowBlower Inverter Generator Lawn Mower And Small Gas Engine (HM006A HOUR METER----Track the number of hours the engine has worked. Jayron JR-HM032A Self Powered Digital Tach/Inductive/Maintenance /Waterproof/Backlit/Shutdown Hour Meter,Battery Replaceable,for Lawn Mower Tractor Generators... OTHER----Battery can be replaced; User shutdown,data remains after shutdown; waterproof rating: IP65; 2 year warranty. Returning to the home screen if there is no operation on other screen for more than 10s automatically. - - - 2.96 ounces 7.4 x 4.2 x 1 inches 4 Tachometer (RPM) Function When the equipment is working, the tachometer will record the RPM in real time currently., Range:0-20000 RPM. The LCD screen displays red backlight when warning ; the green backlight can be set to be always on,turn off or automatically adjusted.