Whereas the accuracy of an instrument is how close a measured value is to the actual value. Similar to precision, accuracy is also inversely proportional to the L. Accuracy of an instrument is always less than its L. Mathematically a measurement instrument Least Count is calculated by dividing main scale reading by the total number of divisions on the main scale.
And if the instrument also has a Secondary scale. Then instrument LC is the ratio of main scale L. It is calculated by dividing the main scale reading 1 cm by the number of divisions of the main scale Least Count of Mechanical Vernier Caliper is 0. Because it can measure a minimum 0. In the simplest manner, we can define the least count of an instrument as the minimum value that we can measure from it.
For example, the smallest distance that we can measure from a meter scale is 1mm, therefore the least count of meter scale is 1mm. The least count is an indication of the accuracy and precision of the instrument. Lesser is the least count of an instrument higher will be its accuracy. Least count should not be confused with accuracy, these are two completely different terms. Accuracy is the measure of how close to a certain value an instrument can measure.
In metrology, the least count of a measuring instrument is the smallest change in the measured quantity that can be resolved on the instrument's scale.
The least count is related to the precision of an instrument; an instrument that can measure smaller changes in a value relative to another instrument has a smaller "least count" value and so is more precise. Any measurement made by the instrument can be considered repeatable to no less than the resolution of the least count.
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