Straight boat tester light: this spark plug engine ignition tester accurately determines the status of the spark plug ignition and the inline spark tester engine ignition. Spark plug tester: with its precise measuring functions, it can accurately detect the ignition status of your vehicle's spark plugs and thus help you quickly identify problems. Spark plug engine ignition tester: in addition to testing spark plugs, it can also be used to test other automotive parts, the spark plug tester. Spark tester: In addition, it comes with a car test pen that makes it easier to test and repair the ignition system of your vehicle as well as the car spark plug tester. Use scenarios - Regular maintenance and diagnostics: quickly verify the ignition status of spark plugs to confirm proper operation and identify ignition-related problems. - After service or replacement: test spark plugs and related components to ensure the ignition system is functioning correctly. - Troubleshooting and broader testing: use the tester to check other automotive parts beyond spark plugs, with the car test pen assisting in testing and repair of the ignition system.