Lgnition Spark Tester With Spark Gap: The tester can show if there is ignition voltage and its intensity. In contrast to spark plugs, spark gaps can be tested on this tool. So you can check the power reserve. You can adjust the spark gap by turning the adjustable screw. A good and intact ignition system should have a clearance of at least 15 mm. Advantage of ignition spark tester: Determine the quality of the coil based on the color of the sparks and the flashes in the distance Intuitive and easy to understand the operation of the ignition coil Alligator clip securely fixed to the ground Screw assembly allows quick and easy adjustment of spark gap Avoid fire, burnout of ignition coil, etc.