- Easily diagnose ignition system issues at each cylinder without needing a mechanic using this ignition spark tester. Save time and money with at-home troubleshooting. - The specially designed grooved end increases contact area between the wire and instrument, delivering accurate test results for enhanced reliability. - Compatible with breaker point and electronic ignition systems, this spark detection test pen effectively tests spark plugs, coils, and distributors to help you identify potential ignition problems. - The larger grooved end ensures optimal contact, allowing for precise testing and improving the ease of use, making it an essential tool for any DIY car enthusiast or professional. Usage scenarios: 1. Quickly check the ignition system before a long road trip to ensure your car is ready to go. 2. Troubleshoot starting issues at home by testing each cylinder individually to pinpoint the exact problem. 3. Use it during routine maintenance checks to confirm that all spark plugs and coils are functioning correctly. This ignition spark tester is compact and easy to handle, ensuring you can carry it wherever needed. Its robust construction guarantees durability, making it a reliable addition to your automotive toolkit.