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RocwooD Spark Plug Tester. SPARK CHECKER Eliminate the guesswork without removing the sparkplug This safe, precise tool detects proper spark, shorted or using advanced micro-circuit technology. Simply clip it free operation makes it easy. Compatible with all 2 & 4 stroke engines, including those Perfect for diagnosing problems in outdoor power equipment, This gives an easy way to check if your batteries or spark without having to turn the engine on. Assists in seeing issue. Place the gripper onto a plug wire or a recoil start * 3 LED lights and attached troubleshooting tag problem. * One AAA 1.5-volt alkaline battery included – * Spring-loaded gripper hook with auto on and Furthermore it comes with an AAA battery and handy spark checker. Plug Plug Cap Plug Cap. Mospare: 01563