ISO 27893:2011 Vacuum technology - Vacuum gauges - Evaluation of the uncertainties of results of calibrations by direct comparison with a reference gauge
ISO 3567:2011 Vacuum gauges - Calibration by direct comparison with a reference gauge
ISO/IEC 17025:2005 General requirements for the competence of testing and calibration laboratories
BS ISO 19685:2017 history
2017BS ISO 19685:2017 Vacuum technology. Vacuum gauges. Specifications, calibration and measurement uncertainties for Pirani gauges