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The International Temperature Scale of 1990, ITS-90 defines temperature with a range of fixed points, over the temperature range from -189°C (Triple Point of Argon) to 962°C (Freezing Point of Silver) a Standard Platinum Resistance Thermometer is used as the interpolation device. The ITS-90 specifies the SPRTs must be made with high purity, platinum, strain-free wires that meet specified conditions.

Isotech Model 670 SPRT

-200°C to 670°C

Isotech Model 909 SPRT

-196°C to 670°C

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