LCD digital gasoline Inductive Tachometer for paramotors, microlights, marine engines - inboards and outboard pumps, generators, mowers, model boats, motor cycles, scooters, cleaners and chainsaws. HM-A011 works on most gas engine, up to 8 cylinders. It has a powerful timing and RPM measuring system. Timing System: accumulating total running hours HOURS, maintenance timer can be set freely to 0-9999.9 hours SERVICE. RPM Measuring System: measuring current engine RPM. The Tachometer is easy installed by wrapping it around the spark plug wire of the engine. It has a replaceable CR2450 battery and waterproof Rate IP65. User Manual Product Size 73.5mm*47mm*20.5mm Display Screen LCD Screen Size 42mm*12.5mm Button Type Touch Switch Refresh Rate 1S Hour Range 0-99999H Maintenance Timer 0-9999.9H RPM Range 0-30000RPM RPM Accuracy 10RPM Timing Precision 0.1min Introduction Wire Type UL2464 26AWG/2C Packing Size 72mm*72mm*48mm N.W. 80g Waterproof Rate IP65 Induction Wire Length 1.70M Battery Specification CR2450 550mAH Housing Material ABS Package White Box