Dr. Henrik S. Nielsen is an internationally recognized expert in Geometrical Product Specifications (GPS), dimensional metrology, laboratory accreditation and measurement uncertainty. He is a former chairman of the ISO/TC 213 GPS committee. This site presents his GPS and uncertainty training courses, books, and research. He is also the HN behind HN Proficiency Testing, a leading proficiency testing service provider for accredited calibration and dimensional inspection laboratories.
Estimating Measurement Uncertainty
Understanding and quantifying all sources of uncertainty in a measurement — essential knowledge for calibration and testing laboratories.
Uncertainty Training ↗
Online measurement uncertainty course for calibration and metrology professionals.
GPS Courses ↗
Online courses in Geometrical Product Specifications and dimensional tolerancing — free introductory through advanced levels.
What is Geometrical Product Specifications
An introduction to the ISO GPS framework — the language of engineering drawings for specifying geometry, dimensions, and tolerances.
The ISO GPS Handbook
2nd edition, 2024
The definitive ISO GPS reference for engineers and metrologists.
Can be ordered from ISO or Danish Standards.
The GPS Pocket Book
Quick-reference guide to GPS standards and tolerancing concepts.
HN Proficiency Testing ↗
Henrik's proficiency testing service for accredited calibration and dimensional inspection laboratories.
About
Biography, résumé, and professional background of Dr. Henrik S. Nielsen.
Papers & Research
Technical papers, articles, and newsletters on GPS, metrology, and measurement uncertainty.