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Spark Plug Tester Ignition 12V In-Line Spark Tester Diagnostic Tool For Auto Car Features-Test for no spark condition -Essential for trouble shooting all internal combustion engines -Tests for lack of spark condition-Easily test ignition circuit continuity at each cylinder-Connects between spark plug and spark plug wire-Indicator light flashes when circuit is working-Great for troubleshooting any internal combustion engine-Find dirty spark plugs， defective points， bad cables or connections， etc.Specifications Material：stainless steel+plasticSize：275mmColor：blackHow to use -With engine off remove spark plug wire-Attach black connector spark plug-Insert metal end of tester into spark plug -Try to start the engine -If ignition circuit is complete， bulb will flashPackage included1 x Spark Plug Tester / in a pack