Key benefits Fast on-the-spot diagnosis of ignition problems so you can find faults without removing parts or visiting a shop. Identifies common causes of misfires: dirty spark plug connections, worn points, damaged spark plug wires, and poor connections. Tests ignition coil and individual cylinder ignition condition, helping pinpoint which cylinder or component needs attention. What it is and how it works A spark/ignition tester designed for 12V drive gasoline spark plug systems. Plugs in between the spark plug and the spark plug wire in seconds to simulate normal operation and show whether a healthy spark is present. New design includes a shrapnel contact for a secure electrical connection between the wire and the tester. Main functions and compatibility Spark tester: checks spark delivery to gasoline spark plugs on 12V systems. Ignition tester: quickly troubleshoots dirty plug connections, defective points, bad cables, or loose connections by inserting the tester between the plug and wire. Ignition coil test: lets you verify ignition coil function and the ignition condition at each cylinder without removing coils or going to a mechanic. Why customers need it Saves time and money by allowing quick, accurate preliminary diagnosis at home, in the shop, or roadside. Helps avoid trial-and-error parts replacement by narrowing the problem to wire, plug, points, or coil. Simple to use for mechanics and DIYers alike; no special tools or extensive disassembly required. Practical attributes Function: plug-and-test spark/ignition diagnostics for 12V gasoline engines. Compatibility: suitable for standard 12V drive gasoline spark plug ignition systems. Performance: provides immediate visual/audible confirmation of spark delivery and coil activity. Design note: the updated structure uses a shrapnel contact to maintain reliable connection during testing. Use scenarios Home garage troubleshooting: Connect the tester between the plug and wire to quickly determine whether a misfire is caused by the plug, wire, or coil before replacing parts. Pre-trip inspection: Verify each cylinder’s ignition to prevent roadside breakdowns by spotting weak coils or poor connections. Mobile repairs and diagnostics: Perform fast ignition checks at a breakdown site to identify if the fault is electrical (wire/coil/points) or related to other engine systems. What you can expect Quick, clear indication of spark presence and coil activity. A straightforward diagnostic step that reduces unnecessary parts purchases and time spent searching for faults. Reliable connection during testing thanks to the shrapnel contact design.