what do you understand by the term zero error
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Zero error is defined as the condition where a measuring instrument registers a reading when there should not be any reading. In case of vernier calipers it occurs when a zero on main scale does not coincide with a zero on vernier scale.
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Zero error is a technical term, which means how far away from zero is the reading of the insrument when the real value is known to be zero. It can be either positive or negative. This is a part of calibration. All measuring instruments need to be periodically calibrated.
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