By comparing the spark intensities of the two spark plugs, judge the performance and ignition intensity of the spark plugs. ANCEL SP02 Spark Plug Tester with Dual Testing Hole, Dual Hole Car Spark Plug Tester Ignition Plug Analyzer Diagnostic Detector 12V, Spark Plug Tester and Coil Tester, 0 to 6000rpm, for 12mm Spark Plug.
