Performance Tool Inline Ignition Spark Tester

The Performance Tool W86554 Spark Tester is an easy-to-use tool that quickly connects between the spark plug and spark plug wire for reliable testing of your engine's ignition system. By checking the condition of your ignition system at each cylinder, this tool can help improve engine performance with more reliable spark and efficient combustion. With a mirror image of ignition spark flashing, you can easily troubleshoot dirty spark plug connections, defective points, bad cables or connections, and more. This tool shows voltage to the plug, with a brighter light indicating a stronger voltage, making it easier to diagnose potential issues. With a 5-Inch spark plug connection and an overall length of 8-1/2 in., the W86554 Spark Tester is compatible with most vehicles, making it a must-have tool for any garage or mechanic.