What is called least count? Md. Saifur Rahman What is least count?If the circular scale is rotated only one division the distance that the screw covers for that one rotation is said to be least count.You may likeDo I need car insurance?What is car insurance?How could I get cheaper car insurance?What is auto insurance?Why Adulterant food is the barrier to sound health?What are the producers?What are food preservatives?What is food chain?What is tertiary consumer?