1. Material: The car ignition coil tester is crafted from quality ABS material, offering impact resistance, heat resistance, shockproof properties, and lowtemperature tolerance, ensuring safety and reliability. It is lightweight and portable, making it easy to store in a kit for longterm use. 2. Safety Protection: For enhanced safety, the car ignition tester features a transparent protective cover to prevent accidental contact. During spark plug testing, the voltage is extremely —always cover the protective shield before use to ensure operator safety while allowing clear visual observation of test results. 3. Easy to Use: The car spark plug tester is userfriendly and ready for immediate use upon connecting the adapter. Equipped with a voltage indicator light, it provides instant visibility into spark plug conditions. It also simulates engine operation, replicating car startup scenarios for more accurate spark plug testing. 4. DualHole Simultaneous Testing: The car spark plug tester includes two test holes, enabling simultaneous comparison of and old spark plugs. This allows for performance and ignition intensity assessment, helping identify and faulty spark plugs promptly to enhance engine efficiency—saving time and improving productivity.