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Calipers are used to measure openings and galleries in lidded forms. In other words, they are an adjustable tool for measuring the inside and outside diameters, as in making lids for pots and jars. While it is initially used to measure openings for lids, they can also be used to measure a cup with a saucer that has a middle depression that fits the base of the cup precisely. No need for guesswork anymore! All you need is a pair of these and you will be able to create lids in no time.