This product is used for two-stroke or four-stroke fuel or gasoline engines with up to 8 cylinders (speed RPM) measurement, engine operating timing cumulative time, and some other unique functional designs. Energy saving, convenient and practical: When the gasoline engine is not working, the tachometer automatically saves energy and electricity, and automatically turns off the display; when the gasoline engine is working, the tachometer automatically starts testing. 1. LCD display, low voltage design, built-in battery (CR2450) power supply, inductive design, safe and reliable. 2. Multiple measurement methods: After installing one end of the electronic wire on the electronic watch case, use a metal clip to clamp it on the spark plug wire sheath for induction measurement; bundle the electronic wire on the spark plug wire sleeve and wrap it several times for induction measurement; handheld The tachometer is measured 3 cm to 5 cm close to the spark plug wire sheath. 3. Timing range: 1 minute to 99999 (MIN minutes). All our products undergo strict quality inspection. If there are any quality issues or you are not satisfied with the product > Contact us. We will provide you with the best solution. Our products are made from the highest quality materials and designed to provide you with the best user experience. We strive to ship all orders within three days of purchase, with an estimated time of 8-22562 days. When shopping, please note the size and dimensions of the product to ensure it meets your needs. In the title and we have provided detailed information about the product, including its features and specifications. We want you to be completely satisfied with your purchase, so if you have any questions or concerns please do not hesitate to contact us. We are here to help and will do our best to assist you. Thank you for choosing our product. we hope you like it