What does Vernier caliper measure?
Channel: Physics Partner
Date: 2022-07-07

What is Vernier Caliper?
A vernier caliper is defined as

A measuring device that is used for the measurement of linear dimensions. It is also used for the measurement of diameters of round objects with the help of the measuring jaws.

French mathematician Pierre Vernier invented the vernier scale in 1631. The main use of the vernier caliper over the main scale is to get an accurate and precise measurement.

The least count of vernier calipers is also known as the vernier constant. It is defined as the difference between one main scale division and one vernier scale division.

Zero error is defined as the condition in which the measuring device registers a reading when there should not be any reading.

The zero error of vernier caliper is calculated as:

Actual reading = Main scale + Vernier scale – (Zero error)

There are two types of zero error:

Positive zero error: When the jaws of the vernier caliper are closed and the reading is positive and away from the actual reading of 0.00 mm. For instance, if the reading is 0.08 mm, then the zero error is +0.08 mm.
Negative zero error: When the jaws of the vernier caliper are closed and the reading is negative and away from the actual reading of 0.00 mm. For instance, if the reading is 0.10 mm, then the zero error is -0.10 mm.