What is the least count of screw gauge?

$0$

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$0.1 m m$

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$0.01 m m$

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$0.001 m m$

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Solution

The correct option is C
$0.01 m m$

The least count of screw gauges is $0.001 c m$ .
Mathematically; $L e a s t c o u n t = \frac{P i t c h}{N u m b e r o f d i v i s o n s}$ .
Applying the value:
$= \frac{1 m m}{100} = 0.01 m m$
Hence, the correct answer is option (C).

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