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03-05-2017, 10:52 PM( This post was last modified: 03-05-2017, 10:58 PM by tigerluver )
From the upper inner part of the mouth to the lower it's 7.5 cm. When using the mouth of the caliper you use the the measurement where the sliding part's 0 rests. You do this because if you notice, the top half of the mouth of the caliper is touching the object a few millimeters before the stationary part's 0.