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Which material is used when radiation pyrometers don’t produce a satisfactory result?

Which material is used when radiation pyrometers don’t produce a satisfactory result? Correct Answer Rhodium-Platinum

10% Rhodium-Platinum is a noble-metal thermocouple used for measuring very high temperatures. It can be used in a temperature range of 32-3200 F. These are used when radiation or optical pyrometers do not perform satisfactorily.

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