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ED NOTE: In this last video, the speaker refers to the thermocouple calibration information (e.g. table and formulae) on the NIST website, the ITS-90 Thermocouple Database. One should know that there are also worldwide standards for such tables and that most thermocouple suppliers will provide assistance and free copies of the tables and often the formulae (polynomials).
ASTM International is one of the principle supplier of Thermocouple Calibration Standards and updates the tables for the standardized types of thermocouples after each change in the International Temperature Scale. See our pages on standards and scales for more details.