Answer:
Gas thermometer for -\[\text{8}0{}^\circ \text{C}\]. Mercury thermometer for\[\text{6}0{}^\circ \text{C}\]. Platinum resistance thermometer for \[\text{25}0{}^\circ \text{C}\] and\[\text{78}0{}^\circ \text{C}\]. Total radiation pyrometer for\[\text{2}000{}^\circ \text{C}\].
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