After a complete rotation of the screw, the screw with attached scale perhaps advances by an amount of 1 mm and this displacement is called the pitch of the screw. If the screw of screw gauge is rotated once, its displacement and the screw, when the circular scale is rotated only once.
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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.
The highest possible error while measuring a quantity is known as absolute error.