Wires coils tool - high-brightness bulb makes the measurement results easy to observe; car spark plug indicator. Ignition spark indicator - nose tip prevents lead puncturing; high-intensity bulb and viewing window for greater flash concentration; ignition test pen. Ignition coil test tool - with the engine running, place the grooved end tool over the spark plug wire; the bulb will flash to indicate spark; car ignition test pen. Coils pen - use this ignition spark tester to check the condition of the ignition system at each cylinder without mechanics; ignition spark tester. Use scenarios: - Quick diagnosis on a running engine: test each spark plug wire to confirm spark presence and identify misfires. - Post-repair verification: after replacing coils or plugs, verify that each cylinder delivers spark with the tool. - DIY maintenance: check ignition system performance across all cylinders without specialized equipment or professional help.