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By certification 
Type T Thermocouple (Copper/Constantan)
The Type T is a very stable thermocouple and is often used in extremely low temperature applications such as cryogenics or ultra low freezers. It is found in other laboratory environments as well. The type T has excellent repeatability between –380F to 392F (–200C to 200C).
Type T Temperature Range:
Thermocouple grade wire, -454 to 700F (-270 to 370C)
Extension wire, 32 to 392F (0 to 200C)
Type T Accuracy (whichever is greater):
Standard: +/- 1.0C or +/- .75%
Special Limits of Error: +/- 0.5C or 0.4%
Consideration for Bare Wire Type T thermocouple Applications:
The Type T Is Well Suited To Oxidizing Atmospheres
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