inside caliper

a caliper whose legs turn outward so that it can accurately measure inside dimensions, as the inside diameter of a pipe. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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inside caliper

caliper for measuring inside dimensions (the size of a cavity or hole); points on its legs curve outward 
WordNet® 3.0, © 2006 by Princeton University.
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