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Only way to be sure.
If you want to be really sure, you'll want the 25-30 and 30-40 bore mics, at which point you might as well get the three piece set so you can check BB30 shell bearing bores properly too. Admittedly it's more than twice what you paid for the bike, but there's no point skimping on tools :)
gbj_tester
Howard
dancing james
Only way to be sure.