Coil-On-Plug-Test-Extension-Sealey-VS5263-Allows-for-inductive-couplers-to-be-used-on-engines-that-have-no-HT-leads-to-diagnose-engine-faults-Ideal-for-coil-pack-diagnostics-on-modern-engines-Enables-the-technician-to-correctly-diagnose-a-fault-without-unnecessary-component-changing-Simply-plugs-in-between-the-coil-pack-&-spark-plug-Coil-On-Plug-Test-Extension