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the competition one is fairly accuret. the regual cheap modle is not becuase it takes forever to mount it right ot get correct times etc... its a cool tool though.
POS. Big waste of money. I got rid of mine on Ebay for 200 bucks.
oh my god $200 is that the competition modle or the cheap one? the cheap ones suck cause they have to be dead level to work and they are like 20-30 bucks off ebay. i wanted to get one to just play with but i dont care enough to ever do it.