This spark plug tester provides precise ignition status detection for car spark plugs, enabling you to identify ignition issues quickly and accurately. Inline spark plug tester and coil detector: a compact, essential tool for both drivers and car enthusiasts. It functions as a spark plug coil detector to inspect ignition components in one convenient device. Spark car plug tester: this tool can accurately detect the ignition status of your car spark plugs, supporting fast diagnostics and reliable maintenance. Spark plug testing tool: a must-have accessory for any car enthusiast or mechanic, serving as a spark plug detector tester for everyday inspections and repairs. Use scenarios - Routine maintenance on a daily driver: quickly verify spark plug ignition health to prevent misfires and ensure dependable starts. - After installing new plugs or ignition coils: confirm proper ignition operation before road testing. - In a workshop or garage: diagnose intermittent ignition problems across cylinders by testing individual spark plugs and coils.