Disappearing filament pyrometer
Encyclopedia
The disappearing filament pyrometer is an optical pyrometer, in which comparison is made between two bright objects to determine temperature
Temperature
Temperature is a physical property of matter that quantitatively expresses the common notions of hot and cold. Objects of low temperature are cold, while various degrees of higher temperatures are referred to as warm or hot...

. More information is available from the suppliers http://www.spectrodyne.com/ and http://www.pyrometer.com/.
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