pyroscope
  高溫儀; 測熱輻射器; 測溫熔錐
  Pyr·o·scope n.  Physics An instrument for measuring the intensity of heat radiating from a fire, or the cooling influence of bodies. It is a differential thermometer, having one bulb coated with gold or silver leaf. [R.]
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  pyroscope
       n : a pyrometer that uses the color of the light emitted by a
           hot object [syn: optical pyrometer]