My right stick tends to be lighter because it is played with a bit more harder than my left hand....yes....due to rim shots. good point. I never tape my sticks...i use vics and i hate all the extra junky weight on the sticks when you put tape on them.
anyways...back to the topic.. I would use an electric scale ( the ones that go to the like 100th place :P ) and do that. most high schools should have one somewhere in there athletic department...