The light indicator shows the color of the spark very clearly so you can identify problem. This is a practical diagnostic tool for any engine with spark plugs.
Simply connect the spark plug tester for small engines between the spark plug and the plug wire, and if a spark is being sent, the tester will mirror the spark and light up.
Great for troubleshooting any internal combustion engine, armature diagnostic detector can quickly and easily diagnose ignition/engine outboard motor issues or a fault in the fuel.
If you test under bright lighting conditions and don't get the correct results or can't see well, try again in a less bright environment.
Material: Rubber + Metal
Color: Black
Weight: 4.41 Ounces
Package Included: 2 x Spark Plug Testers
When you have connected the spark plug tester and started the engine, you can let the engine go on for a while and allow the spark plug tester to work better.