Metric vernier calipers
The main scale on the bar is graduated in millimeters, and every
main division is numbered. Each numbered division has a value of 10
millimeters; for example, #1 represents 10 mm, # 2 represents 20 mm,
etc. There are 50 graduations on the sliding jaw vernier scale, with
every fifth one being numbered. These 50 occupy the same space as 49
graduations on the main scale (49mm). Therefore 1 vernier division=
=0.98mm
The difference between 1 main scale division and 1 vernier scale
division=1-0.98=0.02mm.