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Check the listing for details. Dual Plug Car Kit Spark Plug Tester 12V Gasoline Ignition Plug Diagnostic Tool. Condition: New. Listed at 26.54 USD. Simple to use just remove rubber boot from spark plug, insert tester & place tester boot on plug. 1 To 2 OBDII OBD2 16 Pin Car Diagnostic Code Reader Extension Cable Splitter. Must-have diagnostic tool for any engine with a spark plug.