Measurement work is generally divided into ten major tasks. If an internal calibration certificate is issued, the name of your work unit and the name of the instrument that can be calibrated will be indicated on the certificate. For example, if the internal calibration certificate indicates calipers, micrometers and indicator meters, then you can only be responsible for the metrological calibration of such instruments in your enterprise. The internal calibration certificate will be audited for three years.

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-Teacher Xu, School of Radio and Television Quality.