Feature 1HIGH ACCURACY READING: The 12V hour meter tracks the life of your outboard motor or boat, is easy to install, and provides a high accuracy reading of up to 99,999.9 hours. 2ENGINE RUNNING HOUR METER: Mechanical hour meter gauge is applicable for small engines, tractors, skid steer loaders, RV generators, equipment and boats. 3OPERATING VOLTAGE: The mechanical hour meter is suitable for monitoring the maintenance needs of derv engines. The hour meter operates on DC 12-36 volts and never loses count. 4ADVANTAGES: Mechanical hour meter features low power consumption, automatic reversing and fully sealed design, dust prevention and dampproof design to ensure stable performance and easy installation. 5WIDELY USED: For tracking the time of machinery such as boats, cars, trucks, tractors, air compressors, lawn mowers, snow blowers, off road vehicles, or any other equipment. Use to determine oil change intervals, service requirements, or need to record run time.Item Type: Mechanical Hour MeterVoltage: DC 12V to 36VPower: 0.3WMaximum Display: 99999.9 hoursTiming Accuracy: 0.1 hoursStorage and Operating: -10C to +50CFeatures: The meter has positive and negative wires for easy installation. Just connect the positive and negative to power. The timer has a 6 digit digital display with the lowest effective digit of 1/10 hour (99999.9), input voltage of 12-36 DC. The hour meter timing device contains a quartz oscillator for high accuracy. Low power consumption, fully sealed, dust prevention. Automatic flip, no battery needed, long use life.Applications: Track the time of machinery such as boats, cars, trucks, tractors, etc., using time to determine oil change intervals, service requirements, or record operating time.Fitment: Fit for Derv Engine Generator Boat Motorcross Motor Truck Tractor .wang-edit-text{ font-family:'Arial' !important; } .wang-edit-text table { border-top: 1px solid #000; border-left: 1px solid #000; } .wang-edit-text table td, .wang-edit-text table th { border-bottom: 1px solid #000; border-right: 1px solid #000; padding: 3px 5px; } .wang-edit-text table th { text-align: center; }Package List1 x Mechanical Hour MeterNoteThe product does not have an 'auto zero' function.