Question

While using Vernier calipers to measure the internal diameter of a cylindrical pipe,
pick out the correct one from the parts of the Vernier caliper given below.

Depth probe, retainer, lower jaws, upper jaws

Answer 1

I think the answer should probably be retainers but you can re check it coz I am not sure

Answer 2

lower and upper jaws will be used.
So, lower jaw is correct