what is the least count of galvanometer and ammeter ?how  will we able to find it ?​

Least count of a measuring instrument is the least value of physical quantity that can be measured accurately using the instrument. 

For example, Take a simple scale (length measuring instrument) of 15 cm. In this scale, you can see that the 1 cm is divided into 10 equal parts. Therefore, the least value it can measure is 1cm/10=0.1cm or 1mm which is least count of this instrument.


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There is no least count to a galvanometer since it does not depict any quantity, while that of ammeter differs with different ranged devices.
Actually least count is the smallest value that can be measured accurately by a device.
Least count = maximum value of quantity/number of divisons.
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