Spark Tester, Stephens - 4-Wire for up to 4-cylinder Engines

Stevens Spark Checker Highest quality, versatile open-gap spark checker for small engines and outboards with 1 to 4 cylinders.  We also carry an 8-wire version for bigger engines. Checker is furnished with a ground wire and clip (as shown in image). Sliding mechanism adjusts the open-gap which is marked from 1/4" to 1/2" as well as in millimeters. Black background for easy visibility is recessed to prevent carbon tracking. Tool is highly resistant to chemical, UV and physical damage.