Zero error is when the jaws of the vernier calipers are fully closed ,and the zero marking on the vernier scale does not coincide with the zero marking on the main scale .
When the zero marking on the vernier scale is on the right of the main scale, it is called a positive zero error.To calculate the accurate measurement, subtract the zero error from the original reading.
When the zero marking on the vernier scale is on the left of the main scale ,it is called a negative zero error .To calculate the accurate measurement, add the zero error from the original reading.
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