pyrometer(n = noun.artifact) - a thermometer designed to measure high temperatures;
is a kind of thermometer
has particulars: optical pyrometer, pyroscope, pyrometric cone, radiation pyrometer, resistance pyrometer

1.  An instrument used for measuring the expansion of solid bodies by heat. [1913 Webster]

2.  An instrument for measuring degrees of heat above those indicated by the mercurial thermometer. [1913 Webster]
" It is usually constructed so as to register the change which the heat to be measured produces in the length of some expansible substance, as a metallic rod, or in the intensity of a thermo-electric current." [1913 Webster]

pyrometer, n. an instrument for measuring high temperatures, esp. in furnaces and kilns.

Derivative:
pyrometric adj. pyrometrically adv. pyrometry n.

N  thermometer, thermometrograph, mercury thermometer, alcohol thermometer, clinical thermometer, dry-bulb thermometer, wet-bulb thermometer, Anschutz thermometer, gas thermometer, telethermometer, color-changing temperature indicator, thermopile, thermoscope, pyrometer, calorimeter, bomb calorimeter, thermistor, thermocouple, thermostat, thermoregulator, (3) Taste.

optical pyrometer, radiation pyrometer, resistance pyrometer