What is Least Count, Vernier Callipers, Diagrams β Etutor

12 Sep 2023

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The smallest measurement that can be made accurately with an instrument is called its βleast count.β The smallest number on a metre scale is 1 mm, while the smallest number on an ammeter is 2 amperes.

A metre scale is used every day to measure how long something is. It is marked off in cm and mm, and each small split is worth 1 mm. So, a metre scale can be used to correctly measure lengths up to 1 mm.

Pierre Vernier, a French scientist, made the first Vernier callipers in 1631. These are tools for making very accurate linear measurements.Vernier callipers are used a lot for quality control measurements in science labs and factories.

1. Main Scale β On one side, the main measure is written in mm and cm, and on the other, it is written in inches.

2. Vernier Scale β The Vernier scale is one that goes up and down. It slides next to the main scale and lets you get numbers on the main scale down to a fraction of a division. On the Vernier scale, there are 100 different parts.

3. Screw β With the help of a screw, the Vernier scale can be placed anywhere on the main scale.

4. Jaws β Itβs got two jaws. The bottom jaws are called βoutside jaws,β and they are used to measure the length of a rod, the diameter of a sphere, or the outside diameter of a cylinder. The upper jaws are called the βinside jaws,β and they are used to measure the inside width of a hollow cylinder or pipe.

5. Strip β The thin strip is used to measure how deep things like beakers are.

Least count of Vernier calliper = Smallest division on the main scale/Number of divisions on the Vernier scale

Least count of Vernier calliper = 1mm/10 divisions

Least count of Vernier calliper = **0.1 mm**