sir pls tell me how to find the ZERO ERROR and LEAST COUNT along with two or three solved questions relating to zero error and least count
It is a defect in a measuring device (Vernier Callipers & Screw Gauge).
When jaws of a Vernier Callipers or Screw Gauge are closed, zero of main scale must coincides with the zero of vernier scale or circular scale in case of screw gauge.
If they do not coincide then it is said that a zero error is present in the instrument.
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