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# NIST-4 Watt Balance

## Appears In

                        - NIST's Newest Watt Balance Brings World One Step Closer to New Kilogram
                        - Redefining the Kelvin: Part of the New SI
                        - Kilogram: The Kibble Balance
                        - Resources for Reporters

The NIST-4 watt balance has measured Planck's constant to within 34 parts per billion, demonstrating that the high-tech scale is accurate enough to assist with 2018's planned redefinition of the kilogram.

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June 20, 2016

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