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An on-site comparison of the quantum Hall effect (QHE) resistance standards of the Physikalisch-Technische Bundesanstalt (PTB) and of the Bureau International des Poids et Mesures (BIPM) was made in October 1995. Measurements of a 100 standard in terms of, the quantized resistance corresponding to the quantum number 2, agreed to -5,5 parts in 10 10 with a relative combined standard uncertainty = 19 10 -10 . Measurements of 10 000 /100 and 100 /1 ratios agreed to -4 parts in 10 10 with = 19 10 -10 and 12 parts in 10 10 with = 26 10 -10 , respectively.

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