- Foot Rule, The - collection of converters, units and measures, data tables, and facilities.
- Lixcaliber - study of the Golden Section and Pi and their relationship to Earth Measure.
- How Many? - dictionary of units of measurement with commentaries and explanations of the English Customary, Metric, and International Systems.
- Measurement Science Conference - promoting education and professionalism in measurement science and related disciplines, held annually in January.
- English Weights and Measures -
- MegaPenny Project, The -
- Science, Optics and You: Powers of 10 - interactive Java tutorial that journeys in stages from 10 million light years beyond the Milky Way, to a treetop, to the nucleus at the heart of an atom, in order to visually describe orders of magnitude.
- Metrology Forum - the science of measurement or calibration and associated topics. Enlightenment to the uninitiated and soul-food to practitioners of this art.
- Scales & Weights - photos of a collection of historical scales and weights, with trading opportunities.
- Uncertainty of Measurement Results - guidelines for the expression of uncertainty in measurement from the National Institute of Standards and Technology.
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