Fast diagnosis - The spark plug tester provides immediate problem detection with an intelligent light indicator and a clear inspection guide. Colors indicate different spark states, helping you assess ignition health quickly. Easy to use - Simply connect the tester and start the engine. No complex tools or specialized skills required, saving time and effort. Wide range of applications - Broadly applicable for spark plug testing in cars, trucks, motorcycles, and other vehicles. Suitable for all types of internal and external combustion engines, making it a versatile tool for ignition system maintenance and repair. Durable and reliable - Constructed with high quality rubber for wear resistance and long service life. Designed to perform reliably across a wide temperature range. Use scenarios - Quick ignition check on a daily driver to identify misfires or weak spark. - Troubleshooting ignition issues on a motorcycle for field repairs. - On site testing for trucks, generators, or lawn equipment to verify ignition system health.