instrument use (vernier)

Question

Main scale division = 1 mm. 10 vernier divisions coincide with 9 main scale divisions. Least count is:

RankGuru · Accepted Answer

The Least Count ($LC$) of a Vernier Calliper is the difference between one Main Scale Division ($MSD$) and one Vernier Scale Division ($VSD$):
$LC = 1 \, MSD - 1 \, VSD$
Given:
- $1 \, MSD = 1 	ext{ mm}$.
- $10 \, VSD = 9 \, MSD = 9 	ext{ mm} \implies 1 \, VSD = 0.9 	ext{ mm}$.
$LC = 1 	ext{ mm} - 0.9 	ext{ mm} = 0.1 	ext{ mm}$.

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instrument use (vernier)

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