- Easy to use ignition spark tester that connects the spark plug to the spark plug wire in seconds to fix dirty spark plug connections, faulty ignition, poor wires or connections. - Check ignition health on each cylinder quickly without visiting an expensive repair shop. - Connects in seconds and requires no special tools for setup. - Compatibility: designed to work with standard spark plug and wire configurations to help test ignition reliability across cylinders. - Performance: provides immediate feedback on spark condition to help identify dirty connections, faulty ignition, or worn wires. Use scenarios - Car or light truck engine showing intermittent misfires or rough idle: test each cylinder to locate the source of ignition trouble. - Lawn mower, generator, or other small gasoline engine after maintenance or plug/wire replacement: verify ignition system is delivering a clean spark on all cylinders. - After replacing ignition coil or wiring connections: perform a quick check to confirm proper connections and circuit integrity before startup.