My Homemage Magnet Matcher

I got the idea to do this from Bob Shaw at a race at Paperboy Raceway in April 2000.  As you can see, it's very simple to buid.  Simply affix a compass and measuring tape to a flat surface.  See below on how it works.

All you have to do is orient the magnet matcher so the needle on the compass points due North.  Then slide a magnet along the tape toward the compass.  The needle will slowly turn South toward the magnet.  Note the spot where the magnet is when the needle first turns completely to the South.  Then test opposite magnets until you find one that turns the needle at the same spot as the first magnet.  Those two magnets are matched.