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. Author manuscript; available in PMC: 2021 Jul 9.
Published in final edited form as: IEEE Instrum Meas Mag. 2020 May;23(3):10.1109/MIM.2020.9082793. doi: 10.1109/MIM.2020.9082793

Fig. 5.

Fig. 5.

Relative uncertainty of mass measurements from 50 μg to 5 kg. The red filled points are from the calibration measurement capability (CMC) of NIST. These points are obtained by a work-down and work-up down from the mass assigned to a prototype. NIST-4 and KIBB-g1 are two Kibble balances, the former working with 1 kg standards, the latter with 1 g standards. The green circles represent relative uncertainties that were obtained with the NIST electrostatic force balance (EFB).