What is meant by zero error in screw gauge?
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An error in the indication of a meter or instrument resulting from a non-zeroreading when the measured quantity is actually zero. ... If the zero of the circular scale is above or below thezero of the main scale , then it is known as zero error in a screw gauge
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When faces A and B of screw gauge come in contact and zero of circular scale doesn't coincide the reference lone , the screw gauge has an error .This error is called zero error..
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shrikant7:
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