Spark Plug Tester Dual Holes 0~6000rpm Adjustable,14/16MM Spark Tester Automotive with Protective Cover,100-240v Plug and Play Engine Ignition Analyzer Automotive Tools,for 12V Gasoline Vehicles

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The media could not be loaded. Works good but doesn't like to send spark below 600rpm. I bought a sparkplug cleaner to see if I could get near new spark plug condition but this tester proved that it couldn't be done. I also was wanting a larger spark from the new plugs and it showed me when I was getting to large of a gap by not having a strong spark.

You can tell which spark plugs are good or going bad

This is a cool tool! I bought it to learn more about how different plugs spark, it’s been a good tool to learn more. Works very well, no complaints so far.

I love this thing! Lost count how many times with misfire I tested the plugs with this tool and you can clearly see the spark plug misfiring compared to the good plug that is known good. Awesome tool!

Es muy fácil de usar y me ahorra mucho dinero en mi taller por q en lugar de tener duda de un misfire en bujías nuevas solo las reviso con esta máquina y listo ...

Works just fine must have

Has saved me a lot of time troubshooting certain types of misfires.