Feature: 1. TOT Recording: Help track how many hours the engine has been working. When the engine is turned off, the display shows the total running time of the engine and remains visible. And the TOT hours are not resettable. 2. JOB Timer: Used to measure the time spent on specific work, such as oil changes. To manipulate the relevant buttons, you can easily view the JOB timer. The JOB timer is resettable. 3. Tachometer Function: Displays real time RPM values and maximum RPM recall. Records the real time RPM value at engine is on. Various engine ignition modes can be programmed to make the RPM more accurate. 4. Application: Suitable for all types of gasoline engines. Applicable for outdoor power equipment, generators, agriculture, construction, machinery, vehicles, boats. 5. Installation: Easy to install, with included positive and negatibe cable, and you can following the user manual to plug and play. Specification: Item Type: Engine Hour Meter TachometerMaterial: ABSBattery: 1 button cell CR2032 3V 210mAH (built in battery) Total Hours Reading: From 0 to 99999.9 hours, timing accuracy: 0.1H/1H JOB Timer Reading: From 0 to 99999.9 hours Tachometer Reading: From 0-20000RPM with 10 RPM resolution Product Dimension: Approx. φ60mm x 50mm/2.36 x 1.97in LCD Dual Screen Size: Approx. 30 x 23.5mm/1.18 x 0.93inWire Length: Approx. 1.1m/43.30in (UL1107 AWM 22AWG)Certification: CE RoHS Waterproof Rate: IP65 .Suitable Gasoline Engines: 2 Stroke 1 cylinder, 2 stroke 2 cylinder, 2 stroke 3 cylinder, 4 stroke 1 cylinder, 4 stroke 2 cylinder, 4 stroke 4 cylinder, 4 stroke 6 cylinderApplications:Suitable for outdoor power equipment, generators, agriculture, construction, machinery, vehicles, boats.Fits for lawn mower garden tractor riding mower leaf blower pressure washer chainsaw snowblower brush mower line trimmer string trimmer pressure washer portable inverter generator motorcycle dirtbike atv utv scooter paramotor dual sport bike outboard jetski pontoon boat raceboat hovercraft Package List: 1 x Tachometer3 x Wiring1 x Manual Note: 1. Please use the product in strict accordance with the user manual.2. Do not attempt to disassemble the host and its accessories.3. This instrument adopts waterproof design. It can be used in the rain, but not in the sun or rain for a long time, nor can it be used underwater, otherwise it will cause incorrect display or other problems.4. The measurement error is small, within the normal range.5. Severe vibration and strong impact may make the product ineffective.6. Due to the short service life of the built in battery, please try to use an external power supply when using the instrument, and the external power supply voltage is DC 6‑48V or AC 12‑48V.