ANCEL 12V Dual Holes Ignition Coil Tester Tool Car Ignition Spark Plug Tester

ANCEL Car Spark Plug Tester Dual Hole Petrol Ignition Analyzer Diagnostic Tool. Place the Spark Plug into tester hole 1 or 2; If you want to compare the new spark plug and old one, place new spark plug into hole 1 and the old on into hole 2.