Test pitch of a screw gauge is 1mm and surplus scale as 200 div. While measuring diameter of a wire the main scale reads 2mm and 45th mark on circular scale coincides with the base line. Find the lease count and diameter of the wire.
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The screw gauge is an instrument used for measuring accurately the diameter of a thin wire or the thickness of a sheet of metal. It consists of a U-shaped frame fitted with a screwed spindle which is attached to a thimble. Parallel to the axis of the thimble, a scale graduated in mm is engraved.
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