I use calipers many times a day at work and have made the habit of checking zero every time i pick them up, even if i have just set them down a minute ago. Same with mics. The standards are right there next to the mics in my box, why not use them?
0 to ones? Careful anvil to anvil closing. Two inch mics and up? Use the "standards" held with a wooden cloths pin. For REALLY precise work , the mics should be checked OFTEN, preferably by the same shop "Guru"!
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