Key benefits Quickly identify ignition faults so you can get engines running reliably again. Saves time by isolating cylinder-level problems without dismantling the ignition system. Helps pinpoint common failure points — dirty spark plugs, weak or missing sparks, defective points, bad wires or poor connections — so repairs are targeted and efficient. What it does and why you need it Tests the passage of the ignition circuit on each cylinder to confirm whether spark is present. Diagnoses missing or intermittent ignition sparks so you can determine whether the problem is electrical, a plug issue, or a wiring/connection fault. Ideal for routine troubleshooting and for confirming repairs have resolved ignition faults. Standout features Simple, straightforward testing — designed for quick checks of ignition circuits on individual cylinders. Compatible with all internal combustion engines, making it useful across cars, motorcycles, small engines and more. Durable, job-ready design for shop or field use; built to withstand regular diagnostic work. Attributes Function: verifies ignition circuit continuity and spark presence per cylinder; helps locate plug, point, wire or connection failures. Compatibility: works with all internal combustion engines. Size and handling: compact, handheld form for easy access to engine components (fits typical spark plug and ignition access points). Construction and performance: engineered for reliable, repeatable diagnostics to speed troubleshooting and reduce guesswork. Practical use scenarios Automotive repair: isolate a misfire to a single cylinder on a passenger car to avoid unnecessary parts replacement. Small engine maintenance: verify ignition health on lawnmowers, generators or motorcycles before seasonal use. Field diagnostics for fleet or marine engines: quickly determine whether ignition system or wiring is the source of intermittent running issues. How to use (brief) Connect to the ignition circuit for the cylinder to be tested and observe for spark or signal passage. Use findings to focus further testing or replacement (spark plugs, points, wires, connectors). This tool streamlines ignition troubleshooting, reduces diagnostic time, and helps you make precise repairs across a wide range of internal combustion engines.