(Phys.org) —After two years of difficult and meticulous work examining, refurbishing, and testing the aging workhorse watt balance called NIST-3, PML researchers have used the instrument to obtain their latest measured value of the Planck constant – the first to be released since 2007, and presumably the last to be measured on NIST-3 before its successor, NIST-4, begins operation later this year.
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