Key benefits - Quickly diagnose ignition problems without disassembly or removing components - Visually confirm spark presence and display an indicator light for immediate results - Assess ignition coil performance on each cylinder without mechanical work - Simple, fast setup that requires no special tools What it does - Uses a tester that plugs between the spark plug and the wire connector - When the ignition fires, the tester displays the spark and lights up to indicate status - Supports ignition coil testing and per-cylinder checks for a clear view of engine health How it works - Connect the tester between the spark plug and the wire connector - Observe the indicator when the engine fires to verify spark strength and coil function - Perform quick, cylinder-by-cylinder checks to locate ignition issues Why this stands out - No mechanical disassembly needed to evaluate the ignition system - Fast installation and straightforward interpretation of results - Compact and portable design suitable for garage, shop, or roadside use Compatibility and usage notes - Designed for most automotive ignition systems with spark plug wires - Easy to use on multiple cylinders, providing a straightforward diagnostic workflow - Connects in seconds for rapid troubleshooting during maintenance or repair Use scenarios - Diagnosing intermittent or random engine misfires by testing each cylinder’s spark - Verifying ignition coil health after spark plug or coil replacement during a tune-up - Troubleshooting starting issues, including cold-weather ignition where spark reliability is critical