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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.
A protractor can be used to measure an angle.
Varier calliper
The instrument you are looking for is a compass
The instrument used to measure a angle is called a protractor!