A vernier callipers has 1 mm marks on the mainscale. It has 20 equal divisions on the vernier scale which match with 16 main scale divisions. For this Vernier callipers, the least count is;
0.02 mm
0.05 mm
0.1 mm
0.2 mm
20 VSD = 16 MSD
1 VSD = 0.8 MSD
Least count= MSD – VSD = 1 mm – 0.8 mm = 0.2 mm
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