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The approximations to the International Temperature Scale of 1990 described here provide levels of accuracy that are adequate for the great majority of thermometric requirements, and in general do so with greater convenience or at lower cost than would be the case in realizing the ITS-90 itself. Thermometrists who do require the accuracy only available from, or the imprimatur of, the ITS-90 are referred to the text of that scale and, more particularly, to the comparison monograph to this one: Supplementary Information for the ITS-90.

	Cover pages and Amendments
	Introduction		Part 1
	Part 1: Techniques and Thermometers for Approximating the International Temperature Scale of 1990
	Uniform-Temperature Enclosures Specialized Fixed Points Germanium Resistance Thermometers Rhodium-Iron Resistance Thermometers Vapour Pressure Thermometry Magnetic Thermometry Platinum Resistance Thermometers Platinum Thermocouples Infrared Radiation Thermometers
	Part 2: Techniques and Thermometers Traceable to the International Temperature Scale of 1990		Part 2
	Carbon Resistance Thermometers Carbon-Glass Resistance Thermometers Platinum-Cobalt Resistance Thermometers Diode Thermometers Liquid-in-Glass Thermometry Industrial Platinum Resistance Thermometers Thermistors Base-Metal Thermocouples Thermometry in Magnetic Fields References
	Appendices:
	Differences between the ITS-90 and the EPT-76, and between the ITS-90 and the IPTS-68 Addresses of national standards laboratories Some suppliers of various cryogenic thermometers Calculations relative to the filling of a vapour pressure thermometer Calculation of the aerostatic pressure correction for a vapour pressure thermometer Interpolation polynomicals for standard thermocouple reference tables