What is least count? What is called least count error?

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(N/A) The least count is defined as the smallest value that can be measured accurately by a measuring instrument. For example,the least count of a standard meter scale is $1 \ mm$ or $0.1 \ cm$.
Least count error is a type of systematic error associated with the resolution of the instrument. It occurs because the instrument cannot measure values smaller than its least count. This error can be minimized by using instruments with higher precision (smaller least count) and by improving experimental techniques.

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