Calipers are used to measure the dimension of anarticle. In measuring a section of pipe you would use an inside caliper to give the internal diameter, and an outside caliper to give the external diameter. The difference being the thickness of the pipe wall.
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accurate measurements is one of the basic skills to be mastered in wood workingANS 2 -Measuring tools would include rulers, tape measures, protractors, micrometers, calipers (inside and outside), and laser tapes.
outside
Inside : Outside : : Interior : Exterior
outside
inside