1、Compact Design: Compact digital tachometer with induction design, perfect for measuring engine speed. Features a clip for easy attachment to sparking plug wires. 2、Induction Technology: Utilizes motion sensing technology to measure engine speed by detecting proximity to sparking plug wires. Switches to sleep mode when not in use, with an easy wake up function. Safe and convenient for accurate RPM measurement. 3、Automatic Reset Function: The hour reading of the induction digital tachometer can arrive up to 10000 hours, and then reset to 0. The tachometer can display up to 99999 revolutions per minute. Has system data reset function. 4、Long Lasting Battery: Powered by a rechargeable CR2450 150mAh battery(built in), delivering continuous and efficient performance. Compact and durable ABS and PCB construction ensures durability and longevity. 5、Wide Application: Suitable for 2 or 4 stroke gasoline engines with a speed range of 100 to 30,000 RPM. Ideal for engines in vehicles such as chainsaws, boats, ATVs, motorcycles, and UTVs. Accurate and reliable performance for long term use.