What is the use of thin strip at the back of vernier calliper ?

What is the use of a vernier calliper?

State three uses of a vernier callipers.

Reading A Vernier Calliper

Define the least count of a vernier calliper.

The least count of a vernier callipers is :

The length of a strip measured with a meter rod is 10.0 cm . Its width measured with a vernier callipers is 1.00 cm . The least count of the meter rod is 0.1 cm and that of vernier callipers is 0.01 cm . What will be the error in its area?

The length of a strip measured with a meter rod is 10.0 cm . Its width measured with a vernier callipers is 1.00 cm . The least count of the meter rod is 0.1 cm and that of vernier callipers is 0.01 cm . What will be the error in its area?

What is the least measurement of a vernier calliper?