Thursday, January 24, 2013

Physics Form 4: Chapter 1 - Vernier Calipers

A vernier caliper can measure to the nearest 0.1 mm or 0.01 cm. The ten divisions of the vernier scale on the vernier caliper are spaced over 0.9 cm of the main scale and the aim is to select the vernier graduation which is nearest to being in line with a main scale graduation. 

  • The inner jaws is used to measure inner diameter of the object.
  • The outer jaws is used to measure outer diameter of the object.

How to read a vernier caliper:

Reading = main scale + vernier scale

How about this one?

Reading = 1.2 + 0.03
                 = 1.23 cm

Click on the diagram below to play!