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Lay a ruler across the coin and make sure it measures from one edge through the center to the other edge. Read the diameter from the ruler.
A vernier caliper should be used to measure the diameter of a steel ball.
Yes, a calibrated ocular micrometer can be used to measure the diameter or length of a field or object. Essentially, that is all that it is used for.
It depends on the size of the coin!
Internal diameter.