The least count of the main scale of a screw guage is 1 mm. The minimum number of divisions on its circular scale requird to measure 5 mewm diameter of a wire is The least count of the main scale of a screw guage is 1 mm. The minimum number of divisions on its circular scale requird to measure 5 mewm diameter of a wire is February 10, 2021 Category: Chapter 5 - Rotational Motion , JEE Mains Physics 2002-2019 Solved Video Solutions , Facebook Messenger WhatsApp Share this:TwitterFacebook Related