What is the function of a ratchet in a screw gauge?

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Solution

Screw gauge: It is nothing but a simple device that is used to measure very short lengths (even 10^-6 m or 0.01mm) accurately,
For example, the thickness of the paper, hair, etc.
A ratchet (R) is a kind of limiting device whose function is to present undue tightening of the screw and help in holding the object between the stud (A) and the screw (B) as shown in the diagram.

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