The Performance Tool W86553 Ignition Tester (AC657) is a reliable tool designed to help you diagnose ignition issues in your vehicle. This tester is suitable for use on various ignition systems, including distributor-less, electronic, and multi-spark systems. The W86553 allows you to quickly and easily check for spark and identify potential ignition problems. A must-have tool for DIY enthusiasts and professional mechanics to troubleshoot ignition-related issues effectively.