Maintenance Timer Easily track and manage service intervals for your gasoline engine. The total operating time (TOT) counter can be reset for use on another engine and records up to 99999 hours. A builtin service countdown timer (SVC) lets you schedule maintenance tasks, with a range of 0 to 9999.9 hours or OFF setting. This helps prevent missed service intervals and keeps your engine performing at its . Tachometer Function Monitor your engine's RPM with precision. Supports three different engine firing pattern selections to ensure accurate idle speed adjustment, suitable for a variety of gasoline engines. RPM measurement range is 0 to 20000 RPM with a refresh rate of 0.5 seconds, giving you near realtime data to finetune performance. Water and Shock Resistance Constructed with a durable onepiece housing and fully sealed with epoxy for complete waterproof protection. Designed to withstand strong shocks and vibrations during operation or transport, making it ideal for both indoor and outdoor applications in demanding environments. Battery Saving Design LCD display can be turned off to conserve the builtin CR2450 battery, ensuring longterm reliability. The nonreplaceable battery retains all stored user data even when powered down. A battery back cover with insulating sheet prevents power drain during storage and . Applications Ideal for maintaining lawn mowers, generators, pressure washers, and other gasolinepowered equipment. Useful for marine outboard motors, enabling accurate RPM monitoring and timely maintenance scheduling in harsh environments. Suitable for small industrial gasoline engines where precise RPM control and scheduled servicing extend equipment lifespan. Key Benefits Accurate, resettable hour tracking ensures maintenance is done on time. Realtime RPM monitoring helps optimize performance and prevent engine damage. Rugged waterproof and shockresistant build stands up to tough working conditions. Builtin battery management extends operational life while preserving data. Compatible with a wide range of gasoline engine types through adjustable firing pattern settings.