Least count of an instrument has a direct relationship with the accuracy and precision of that instrument. Therefore it ensures you select the right instrument for your measurement. For example, if you want to measure a 6. Ruler is not a right measurement tool. Because minimum dimension a ruler can measure accurately is 1 mm. In this article we will discuss what is lease count?

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Vernier caliper least counts formula is calculated by dividing the smallest reading of the main scale with the total number of divisions of the vernier scale. LC of vernier caliper is the difference between one smallest reading of the main scale and one smallest reading of vernier scale which is 0.

Vernier caliper is an instrument used to measure the length, diameter, radius, etc. It is used by the lathe mechanic for making metallic cylinders of different sizes. The main scale is graduated is centimeter while Vernier scale slides along the main scale and is graduated in division less than the millimeter.

The lower jaws A and B are used to measure length. The thickness or external diameter of an object. The upper jaws C and D are used to measure the internal diameter of objects like a hollow cylinder or tube. The jaws A and B are fixed where B and D are movable. The movable jaws are attached to the vernier and they slide along the main scale.

When the jaws of Vernier calipers are brought into contact, the zero of the Vernier must coincide with the zero of the main scale. Otherwise, the instrument has an error called zero error. Zero error can be negative or positive. If the zero of the Vernier scale is to the left of the zero of the main scale then the error is negative. Since the zero error is negative, the zero correction will be positive. If the zero of the Vernier scale is to the right of the zero of the main scale then the error is positive.

Since the zero error is positive, the zero correction will be negative. Read also: Types of errors in physics. We can learn about the use of V. C with the help of an example by measuring the area of the cross-section of a solid cylinder by measuring its diameter with Vernier caliper. We will solve this example step by step. Very nice information.. Thanks a lot……. Your email address will not be published. Save my name, email, and website in this browser for the next time I comment.

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## Vernier scale

The least count is an important defining parameter for any kind of scale. It is defined as the minimum value that can be measured on the scale and is the distance between two small graduations. Determining the least count of a vernier caliper is a simple process and it can help make taking readings a quick and sure process using the length formula which we will discuss later. To find the least count of the vernier caliper we first need to find out the least count of the main scale of the caliper. To do this simply count the number of small divisions in between two marked units. Then divide the unit by the number of divisions.

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## What is Least Count and how to calculate it

A vernier scale is a visual aid to take an accurate measurement reading between two graduation markings on a linear scale by using mechanical interpolation ; thereby increasing resolution and reducing measurement uncertainty by using Vernier acuity to reduce human estimation error. The vernier is a subsidiary scale replacing a single measured-value pointer, and has for instance ten divisions equal in distance to nine divisions on the main scale. The interpolated reading is obtained by observing which of the vernier scale graduations is co-incident with a graduation on the main scale, which is easier to perceive than visual estimation between two points. Such an arrangement can go to higher resolution by using higher scale ratios, known as the vernier constant. A vernier may be used on circular or straight scales where a simple linear mechanism is adequate. Examples are calipers and micrometers to measure to fine tolerances , on sextants for navigation , on theodolites in surveying , and generally on scientific instruments. The Vernier principle of interpolation is also used for electronic displacement sensors such as absolute encoders to measure linear or rotational movement, as part of an electronic measuring system.

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## How to find Vernier caliper least count formula?

Vernier caliper least counts formula is calculated by dividing the smallest reading of the main scale with the total number of divisions of the vernier scale. LC of vernier caliper is the difference between one smallest reading of the main scale and one smallest reading of vernier scale which is 0. Vernier caliper is an instrument used to measure the length, diameter, radius, etc. It is used by the lathe mechanic for making metallic cylinders of different sizes. The main scale is graduated is centimeter while Vernier scale slides along the main scale and is graduated in division less than the millimeter. The lower jaws A and B are used to measure length.