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A platinum resistance thermometer PRT, is the commonest thermometer with high accuracy. It may have a range from -200 C to +1 000 C, and an accuracy of up to 0.001 C provided it is installed in an appropriate measuring configuration. Similar thermometers are made from nickel (and other metals), but their cost benefit is obtained at the expense of range and accuracy. In either case, the metal must have been manufactured with the end application in mind. The standard against which high accuracy thermometers should be measured is that of the International Temperature Scale, ITS-90. This specifies a number of reference calibration points such as the triple point of various substances, and of the freezing points of others.

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