National Physical Laboratory

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BS EN ISO 14253-2:1999 Geometrical Product Specifications (GPS) -- Inspection by measurement of workpieces and measuring equipment -- Part 1: Decision rules for proving conformance or non-conformance with specifications

BS EN ISO 14253-2:2011 Geometrical Product Specifications (GPS) -- Inspection by measurement of workpieces and measuring equipment - Part 2: Guide to the estimations of uncertainty in GPS measurement, in calibration of measuring wquipment and in product verification

BS EN ISO 14253-3:2011 Geometrical Product Specifications (GPS) -- Inspection by measurement of workpieces and measuring equipment -- Part 3:  Guidelines for achieving agreements on measurement uncertainty statements