The lowest measurable value is known as the least count.
Voltmeter – System used to calculate the difference in electrical potential between two points in an electric circuit.
we see 10 divisions = 1 volt
Least count (LC) = 1/10
LC = 0.1 V
Ammeter – Device used for measuring the current in a circuit.
we see 10 divisions = 0.2 A
LC = 0.2/10
LC = 0.02A