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Micrometers. Gotta have them! At the very least to check your sizing die.
If you buy a mic try to get one that reads to the tenths (ten thousandths). That’s .0001″. If you ever have to lap a sizing die it is good to know exactly how much you are taking off. It helps take out a lot of the guesswork and can make quick (er) work of a time-consuming job (like lapping a sizing die).