A screw gauge with a pitch of 1 mm has 100 divisions on its circular scale. When it is used to measure the diameter of a thin wire, the main scale reading is 3 mm and the circular scale reading is 45. If D is the diameter of the wire in mm, then find the value of D.
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3.45
Least count 
= 0.01 mm
Diameter of wire = main scale + circular scale reading
= 3 mm + (L. C) x No. of division
= 3 mm + 0.01 x 45
D = 3.45 mm
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