Spark Plug Coil Detector This car spark plug tester accurately detects the ignition status of your car spark plugs and helps you quickly identify problems. It is designed as an essential accessory for both car enthusiasts and mechanics, delivering reliable performance when diagnosing ignition issues. Key benefits - Accurate ignition status detection: quickly confirm whether spark plugs are firing correctly and pinpoint ignition problems. - Dual-function testing: not only tests the ignition indicator but also checks the spark plug itself to meet different diagnostic needs. - Inline tester with precise detection: compact, easy-to-use design that provides clear results and fast problem identification. - Versatile for cars: suitable for a wide range of car ignition systems, making it a practical tool for routine maintenance and troubleshooting. What it does - Tests ignition status: reliably determines whether spark plugs are igniting as expected. - Checks spark plug condition: assesses spark plug performance to help diagnose misfires or weak firing. - Inline design: provides straightforward, precise detection suitable for professional and DIY use. Use scenarios - Routine maintenance: verify spark plug ignition status during scheduled tune-ups to ensure optimal engine performance. - Troubleshooting misfires or hard starts: quickly determine if ignition or spark plug health is the root cause. - Post-replacement verification: after replacing spark plugs, confirm they are firing correctly and operating as intended.