Searon Digital Hour Tachometer RPM Counter for Snowmobile Skis Motor Bike Go Kart Lawn Mower Digital Tach Hour Meter Tachometer will keep track of engine RPMs and running time for RC Toys, PWC, ATV, Motorcycles, Marine Engines, Chain Saws, Tractors, Lawnmowers and Gas Powered Engines. Read Current RPM when engine is on. When engine is off, display total run time of engine and remains visible Hour capacity: 99,999 Hours, Hours accuracy: 0.01. Tachometer capacity: 30,000 RPM, RPM resolution: 10 RPM 2 Years Warranty