Spark Plug Tester Adjustable Dual Hole Car Ignition Plug Detector 0~6000RPM 110V

ANCEL SP02 Spark Plug Tester Ignition 0-6000RPM Adjustable Double Hole Detector. 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.