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Dual Hole Spark Plug Tester – Car Engine Diagnostic Tool 60 meter waterproof Lutein & Zeaxanthin – antioxidantsTest Your Spark Plugs in Seconds Never Guess Again Diagnosing a misfiring engine or rough idle just got easier. This Dual Hole Car Spark Plug Tester lets you quickly check spark plug performance and ignition strength right on your workbench no expensive shop visits required. Simply plug in two spark plugs side by side, power it on, and instantly see which one is firing strong and which one needs replacing. Made in Mainland China. Key Features Dual