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Gauge Type T Thermocouple Wire
W-TW-40 - Physitemp Instruments
Most thermocouple wire used in the manufacture of sensors is "Special Limits" wire which, to meet NIST standards, must be accurate to 0.5°C in the range 0-50°C. This means that even with most sophisticated electronics, the best possible accuracy for the system is 0.5°C.