pyrometer

[pahy-rom-i-ter]
noun
an apparatus for measuring high temperatures that uses the radiation emitted by a hot body as a basis for measurement.

Origin:
1740–50; pyro- + -meter

pyrometric [pahy-ruh-me-trik] , pyrometrical, adjective
pyrometrically, adverb
pyrometry, noun
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World English Dictionary
pyrometer (paɪˈrɒmɪtə)
 
n
an instrument for measuring high temperatures, esp by measuring the brightness (optical pyrometer) or total quantity (radiation pyrometer) of the radiation produced by the source. Other types include the resistance thermometer and the thermocouple
 
pyrometric
 
adj
 
pyro'metrical
 
adj
 
pyro'metrically
 
adv
 
py'rometry
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
The temperature may be measured by a thermocouple or a pyrometer.
Pretest temperatures were also taken using a suction pyrometer.
While the pyrometer measures the sample's surface temperature, the interior
  temperature is the real subject of concern.
Either device must be equipped with an indicating pyrometer which is positioned
  in the working area at the operator's eye level.
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