Spark plug tester designed and manufactured from high-quality, heavy-duty materials to give fast, reliable ignition diagnosis. Key benefits Quickly determine whether the problem is in the ignition system, saving time and money on unnecessary part replacement or disassembly. Diagnose spark presence and spark failures, defective contact points, poor/aging plug wires and other ignition connection faults. Visual verification: observe the spark across the electrode gap to check for weak or inconsistent sparks and timing-related misfires. What it does Tests spark plug connections and ignition leads without removing the plug in many cases. Detects ignition misfires caused by inconsistent spark timing or weak spark energy that can make the engine stumble or lose power. Helps isolate whether the issue is a spark plug, wire, contact point, or another ignition component. Key attributes Construction: heavy-duty build using only premium materials for durability and reliable performance. Size and handling: compact, handheld tool for convenient bench or on-vehicle testing. Compatibility: works with standard spark plug connections and ignition leads to diagnose common automotive and small-engine ignition systems. Performance: provides clear visual spark feedback to help you make confident repair and maintenance decisions. Typical applications Automotive troubleshooting: check spark quality and locate misfires on cars and light trucks during on-vehicle diagnosis. Small engines and powersports: test spark and ignition connections on motorcycles, ATVs, lawnmowers and other small-engine equipment. Workshop maintenance: confirm spark plug and ignition lead condition during routine service to prevent drivability problems. Use this tester to speed up ignition diagnostics, reduce guesswork, and ensure you address the actual cause of engine performance issues.