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Instantly detects true spark and voltage without having to remove spark plugsWorks with DIS (Distributor Ignition Systems)Works with most domestic COP (Coil On Plug) SystemsSimple and easy to useRed light indicates voltage, green light indicates if spark plug is live or dead Instantly checks and diagnoses if your spark plug is firing without having to remove the plug. The OK Spark Spark Plug Sensor is the only tool that measures spark and voltage instantly and accurately.? With our patented PEER (Plasma Energy Event Recognition) technology, check both spark and voltage to detect engine problems and quickly diagnose spark activity. Most Diagnostic Tools products are available for in-store pickup from Advance Auto Parts.