Originally Posted by Poguemahone
Get not simply a caliper, but a metric veneer (sp?) dial caliper. These are capable of giving you extremely accurate measures. They can be found on ebay for around 20-25$ and are worth the price if you do a lot of bike tinkering.
I've yet to find anything on a bike that cannot be dealt with using an inside/outside vernier caliper and some common sense.And often the latter being more important than .oo1 mm or inches.