- Quickly diagnose ignition system problems, including lack or no spark conditions. - Easily test ignition circuit continuity at each cylinder to locate faults. - The tool connects between the spark plug and the plug wire for direct, simple testing. - Suitable for troubleshooting all internal combustion engines. Benefits at a glance - Quickly identify no-spark issues to speed up repairs. - Verify cylinder-by-cylinder ignition continuity to isolate faulty components. - Simple plug-to-wire connection enables fast checks on most engines. - Compact, easy-to-use tool designed for practical field and workshop use. Use scenarios - Car with intermittent misfire: confirm whether the issue is a spark or ignition circuit problem by testing each cylinder. - Motorcycle or ATV with weak spark: quickly verify circuit continuity and spark delivery cylinder by cylinder. - Lawn mower, generator, or other small gasoline engine: diagnose ignition problems without invasive disassembly.