1. ISO 5436, Calibration Specimens — Stylus Instruments — Types, Calibration and Use of Specimens,1985
2. ISO 4287, Geometrical Product Specifications (GPS) — Surface Texture: Profile Method — Terms, Definitions and Surface Texture Parameters,1997
3. ISO 3274, Geometrical Product Specifications (GPS) — Surface Texture: Profile Method — Nominal Characteristics of Contact (stylus) Instruments,1996
4. ISO Guide to the Expression of Uncertainty in Measurement,1995
5. ISO/IEC 17025, General Requirements for the Competence of Testing and Calibration Laboratories,1999