What do you understand by the term zero error?
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Zero error of vernier: If the zero of vernier scale and zero of the main scale do not coincide, when the external jaws of verniers are closed, the vernier is said to have zero error.
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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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