what is screw guaze used for

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Solution

A screw gauge is an instrument to measure length. Measurement through it is called direct method of measurement. It can be used to measure thickness of a very thin wire.
The metre scale is used for distances from 10^-3m to 10²m
Vernier calipers is the next best instrument used to measure distances upto 10^-4m
Screw gauges can measure distances upto 10^-5m. hence they are more precise.

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