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Calibration reference standards / calibration equipment shall be traceable to national standards and be accompanied by certificates of traceability / analysis
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If recognized standards are not available, an independent reproducible standard may be used
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The calibration tolerance of a given standard should be as tight or tighter than the tolerance of the instrument to be calibrated
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A procedure must be in place to ensure tracking and monitoring of standard’s expiration date and re-calibration / re-certification requirements
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Re-calibration records must be retained
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