High Quality Auto Car tester Ignition Spark Indicator Automotive Ignition Detector Spark Plus Tester With Brake Fluid Tester Dear friend, please choose the right product you need, then we will send you the right product fastly, thanks! have a nice shop!1.With the engine running,place the grooved end of the tool over the spark plug wire. The bulb will flash to indicate spark tool tests spark plugs.spark pug wires.ad coils without puncturing the wire.2.test spark plugs, coils, and distributors on breaker point and electronic ignition systems .3.Blunt nose tip prevents lead puncturing4.High intensity bulb and viewing window for greater flash concentraiton5.operation instrcution:With the engine running, place the grooved end of the tool over the spark plug wire.The bulb will glint to indicate the sparkDescription:Material:High quality PlasticColor:As the pictureSize: 125mmPackage Included:1* Ignition Spark IndicatorNote:1.No Instructions Included.Please ensure before purchase that the item offered is suitable for your purposes.2.Please allow 0.5-1 inch difference due to manual measurement.(1 inch=2.54cm)3.We provide clear pictures, measurements where possible. Please check as much as possible to make sure the item is the one that you need.4.The color of the actual items may slightly different from the listing images due to different computer screen, thanks for your understanding.