Car Spark Plug Tester Dual Hole Adjustable Ignition Spark Plug Analyzer 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.
This product would be ideal for automotive professionals, DIY mechanics, or hobbyists who need to test and ensure the operation of fuel injection spark plugs, specifically for gasoline engines.
