You should use a(n) to track the mean diameter of the pipe for a manufacturing process producing copper pipes.

String

Explanation:

How the measurement is done with a string;

•Wrap a string around the pipe.

•Mark the point where the string touches together.

•Use a ruler or measuring tape to find the length between the tip of the string and the mark you made (circumference)

•Divide the circumference by 3.14159.

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