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Since 1995 Isotech have been producing various designs of special Pt/Au, Pt/Pd, Pd/Au thermocouples for researchers. From our experience we can now offer the most popular of these, the Pt/Au thermocouple in a standard form. All wires are 99.999+% pure and are fully annealed according to the recommendations of McLaren Assembly also follows his prescriptions which have never been bettered. After final assembly and annealing the Pt/Au thermocouples will conform to the reference function derived by Burns within ±0.05°C. For smaller uncertainties we calibrate the thermocouple at the Tin, Zinc, Aluminum and Silver Fixed Points. The associated uncertainties being Zinc ±2.5mK, Aluminium±4mK and Silver ±6mK (1 sigma). The reproducibility of the thermocouples is less than ±0.05°C.