Following my retirement, we have closed our company for new business.

Please do not hesitate to contact me directly, our email portal remains open and I would be delighted to hear from you and provide ongoing support or advice.

Richard Thomson

support@rta-instruments.com

Companies represented up to the end of December 2023. Please now contact them directly.

k-Space Associates, Inc.
Phone: +1 (734) 426-7977
requestinfo@k-space.com
https://www.k-space.com

STAIB INSTRUMENTS GmbH
Phone: +49 8761 76 24 0
sales@staibinstruments.com
https://www.staibinstruments.com/

Wednesday 13 July 2016

Weights are measured

As part of the project to redefine the kilogram the NIST-4 watt balance has completed new measurements of Planck’s constant. The value of h being 6.62606983 x 10–34 kg.m2/s with an uncertainty of plus or minus 22 on the last two digits.
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