1. 3) ISO/TS 3567 Vacuum gauges—Calibration by direct comparison with a reference gauge, (the International Organization for Standardization, Switzerland, 2005)
2. 4) Guide to the expression of uncertainty in measurement, (the International Organization for Standardization, Switzerland, 1995)
3. 7) ISO/IEC 17025 General requirements for the competence of testing and calibration laboratories, (the International Organization for Standardization, Switzerland, 2005)