An instrument has a spindle, an anvil, a sleeve scale marked in millimetres, and a thimble scale, and includes a ratchet to avoid over-tightening on the object being measured. What is this instrument called?

Model answer

micrometer screw gauge

Also accepted: micrometer

Explanation

This is a micrometer screw gauge, used to measure small lengths such as the diameter of a wire to a precision of 0.01 mm.

Derived from ZIMSEC Physics 4023/2 Paper 2 Theory, Specimen Paper, Q1

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