Features & Benefits: Instantly Detects True Spark And Voltage Without Having To Remove Spark Plugs Works With Dis (Distributor Ignition Systems) Works With Most Domestic Cop (Coil On Plug) Systems Simple And Easy To Use Red 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 Os 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..
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