Stop guessing!  This is the best scope available for reading sparkplugs.  We're racers, so we even upgrade this one to have a super white light to
make locating porcelain heat, timing marks and misting even easier.  You say you don't know how to read all the information a sparkplug provides?  Well, you will now.  Our tuning video is included.  This video gives you an intense series of lessons in reading sparkplugs and tuning your engine.  You will watch this video over and over.  Now you have the knowledge and the equipment...go tune that engine! 

More Video/ Information