Check the listing for details. 1 Pc Spark Plug Tester Ignition Plastic & Metal Black Spark Plug Tester. Condition: New. Listed at 14.61 USD. Description:Tests for the lack of spark condition.Tests for proper spark and continuity of the ignition circuit to a specific plug.Essential for troubleshooting all internal combustion engines.Easy to use, get results in seconds.Finds dirty spark plug connections, defective points, bad cables or connections, and more.Bulbs flashes when spark circuit is completed, indicates ignition system or fuel supply problem.Simply connect between spark plug and spark plug wire.Works on all ignition systems including Distributorless Ignition Systems (D.I.S.).Specification:Color: BlackSizes: 11.5x2.2x2.2cm / 4.53"x0.87"x0.87"(L*W*H)Material: Plastic and MetalUsage Guide:With engine off, remove spark plug wire.Attach black connector to spark plug.Insert metal end of tester into spark plug wire.Try to start the engine.