what is backlash error in a screw gauge?

Backlash error occurs in screw gauge, when we try to rotate the screw very fast to measure a reading then there is some slipping between the different screws instead of the rotation, which gives an incorrect reading, to avoid this we should rotate  the screw slowly in only one direction. 

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The error that occurs in a screw gauge due wear and tear of the threads of the gauge is termed to be backlash error...

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sometimes due to wear and tear in the screw gauge the circular scale does not move at once if the ratchet is rotated.this causes an error in finding the pitch of the screw gauge.This is knows as the backlash error of the screw gauge but it can be cured  by not rotating the circular scale immediately  to the other direction but waiting for sometime and making the scale stable and then rotating it .

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sometimes due to wear and tear the threads of the screw it does not move in the direction at once ,this causes an error in the observation this is known as backlash error

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