About This

PROFESSIONAL GRADE STIHL REPLACEMENT: Designed as a direct, high-performance upgrade for the STIHL EDT9 (OEM Part # 5910-850-1100). Essential for precision carburetor tuning, this meter allows you to accurately monitor max RPMs and idle speeds on chainsaws, blowers, and trimmers. Universally compatible with Husqvarna, Echo, Ryobi, and other 1 & 2-cylinder gas engines (up to 16,000 RPM).
DUAL FUNCTION RPM & HOUR TRACKING: Eliminates guesswork by displaying real-time RPMs while the engine is running and automatically switching to total accumulated runtime when the engine is off. Perfect for tracking maintenance intervals for oil changes, spark plugs, and valve adjustments. Includes a "Max RPM" recall function to review peak performance after use.
WATERPROOF & VIBRATION RESISTANT: Built for harsh outdoor environments. The internal electronics are 100% encapsulated in solid-state epoxy, giving the unit an IP68 waterproof rating. It withstands heavy vibration, rain, and mud, ensuring reliability whether you are in the forest or the workshop.
EASY PEEL & STICK INSTALLATION: No wiring harness, ground wire, or complex tools required. Installs in minutes with the included strong adhesive backing. The inductive pickup wire (48" length) simply wraps around your spark plug wire or attaches via the included alligator clip for instant readings.
10-YEAR BATTERY LIFE : Engineered, assembled, and tested in the USA with global and domestic parts. Features a sealed internal lithium battery rated for a decade of service life. No battery replacements are ever needed, offering a truly maintenance-free experience.