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The OEMTOOLS Spark Plug Wire Tester is used to locate faulty plug wires. OEMTOOLS 25045 tests for the presence of spark without risk of shock and without damaging wires. Simply attach alligator clip end of spark plug wire tester to vehicle ground and place receptacle end of spark plug wire tester over spark plug wire with engine runing.Warning: This product can expose you to chemicals which are known to the State of California to cause cancer or reproductive defects. For more information, go to www.P65WARNINGs.ca.gov^