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Everything different, Nothing changes

During the last several years, Mettler-Toledo has been privileged to participate in several strategic partnerships that have contributed to the newly established and highly stable kilogram definition. This video explains the background of the 1 kg redefinition and the effect this change will hav ... more

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  • The importance of traceability in laboratory medicine

    World Metrology Day is celebrated annually on the 20th of May and this year’s focus on health provides an opportunity to emphasize the importance of comparable and reliable measurement results in laboratory medicine. more

  • The Best Measurement

    It is now more than 30 years since attempts started to find a way of defining the kilogram based on an atomic constant or a fundamental physical constant. Since then, two methods have advanced sufficiently far to make it likely that there will be a new definition within the coming years, namely the Watt balance ­experiment for determination of Planck‘s constant h and the Avogadro experiment for determining the ­Avogadro Constant NA. more

  • “Game over” for the Paris kilogram

    For about 200 years, any mass given in kilograms, grams and micrograms referred to a defined artifact accessible in only a single location on earth. A small metal cylinder had represented one kilogram since the metric system was introduced in France. Its successor became world famous as the “International Prototype of the Kilogram” (IPK). more

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Authors Metrology

  • Prof. Dr. Joachim H. Ullrich

    Joachim Ullrich, born in 1956, studied geophysics and physics at the University of Frankfurt where, after graduating in 1983, he also completed his doctorate in 1987 and qualified as a professor in 1994. From 1989 to 1997 he worked as a research assistant at the Gesellschaft für Schwerionenforschung more

  • Dr. André Henrion

    André Henrion, born in 1957, studied chemistry at Humboldt-University in Berlin, where he received his doctorate in 1988 in the field of Physical Organic Chemistry. After working at the Academy of Sciences in Berlin for a short period he moved on to the Physikalisch-Technische Bundesanstalt (PTB) in more

  • Dr. Horst Bettin

    Horst Bettin, born in 1955, studied physics at the Technical University of Braunschweig where he completed his PhD at the Institute for Semiconductor Physics and Optics. In 1990 he joined the Physikalisch-Technische Bundesanstalt and focused his research mainly on density measurements. He has also b more

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