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"Calibrated" doesn't mean "perfect".  The manufacturer of the equipment specifies what the maximum error of their product is, and the calibration lab uses that information, including the temperature, relative humidity, line voltage and several other factors that have to be considered.  THEN the "UUT" (Unit Under Test) is compared with the Cal Lab's standard.  That's the actual definition of calibration: comparison with a calibrated standard with less maximum error than the UUT.