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