Recommendation 3 of the 77th CIPM (1988)
Preparation of the International Temperature Scale of 1990 (ITS-90)
The Comité International des Poids et Mesures
acting in accordance with instructions given in Resolution 7 of the 18th Conférence Générale des Poids et Mesures concerning the preparation of the new international temperature scale,
announces that the differences between the ITS-90 and the IPTS-68 will be approximately those indicated in the graph attached to this Recommendation,
recommends that national laboratories take note of these differences with a view to the implementation of the ITS-90 on 1st January 1990.