Features:Small and light, Approx 2.95" L x 1.53"W. Powered by one lithium battery, no external power connections are required, long service time.Multifunctional: Total Time, Job Timer, Default Setting, RPM Counter, Count Down SVC. Also supports wireless sensing, optimal sensing distance 3cm-5cm. Widely used in hand-push mower, weed whacker, motorcycle, off-road vehicle, beach car, snowmobile, etc.RPM Capacity: 30,000rpm, RPM accuracy: 10 RPM; Hours Capacity: 9999.9 hours, Hours accuracy: 1MIN/0.1H/1H.2 sets of intervals maintenance units (SVC SVC2). The required time can be easily programmed, no need to guess when to change the oil and filter, when the time is reached, the LCD screen will remind you. Maintenance timer can be set freely to 5-10 hours and 10-250 hours SVC SVC2.What You Get: 1*Tachometer. 1*Wire clip. 1*User manual.Specifications:TOT=Total Hours of operation, that is Total Time, once the engine is working, then the positive timing will start, for example, if the engine has been working for one hour, then this meter TOT interface will show 1.0. Cannot be reset to zero.JOB=Hours of operation since the timer was reset, that is JOB TIMER, this is the work time, generally also positive time, it can be reset to zero.SVC: Countdown SVC is Service, is the maintenance countdown, the general default settings, such as 50 hours, 20 hours or 100 hours, and then it will countdown, 100 hours later, it will have a signal to come in, and flashing tips, means that the maintenance should go to change the oil, maintenance time is up.Engine lgnition Mode/Engine Type:8P1r=8 SPARK PER REVOLUTION6P1r=6 SPARK PER REVOLUTION4P1r=4 SPARK PER REVOLUTION3P1r=3 SPARK PER REVOLUTION2P1r=2 SPARK PER REVOLUTION1P1r=1 SPARK PER REVOLUTION1P2r=1 SPARK PER 2 REVOLUTIONItem name: TachometerDisplay: LCDWaterproof rating: IP68Battery type: Built-in Lithium BatteryHours range: 0-9999.9H, accuracy: 1MIN/0.1H/1HMaintenance range: SVC 5-10H, SVC2 10-250HSpeed range: 0-30,000RPM, accuracy: 10RPM. 1P2r mode reaches 30,000rpm(optimal sensing distance 3cm-5cm)Refresh rate: 0.5S.Induction line length: approx. 1.0mDisplay size: 35mm*12.5mmItem Size: As shownNote: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing.