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TEMPERATURE STANDARD Category Quantity Unit temperature Temperature °C (or K) Standard Description Value, range Uncertainty Mercury, Triple Point of Water, Gallium, Tin and Zinc Fixed Point Cells. Standard Platinum Resistance Thermometers Standard thermocouples -38.834 to 419.527 °C -80 to 550 °C -80 to 1600 °C 0.64 mK TO 4.0 mK 2.0mK to 4.0mK 0.3°C to 0.5°C