General description This Digital Engine Hour Meter Tachometer is a multifunctional device designed for ZTR lawn mowers, tractors, and generators. It features a dual screen backlight that displays total running hours, work timer, and tachometer functions, making it an essential tool for monitoring engine performance. Technical specifications TOT hours: 0-99999.9 hours, 0.1 hour accuracy RPM range: 0-20000 rpm, 10 rpm precision Power supply: External AC 12-48V or DC 6-48V Built-in battery: CR2032 Waterproof rate: IP65 Installation Easy to install with a plug-in design Usage Tracks engine/machine running hours Displays total running hours when the engine/machine is off (not resettable) Measures job time for specific tasks (e.g., oil changes, air filter replacements) with a resettable JOB timer Records real-time RPM values to help adjust engine idle Stores and recalls maximum engine RPM