telethermometer

from WordNet (r) 3.0 (2006)

telethermometer
    n 1: a thermometer that registers the temperature at some
         distant point

from The Collaborative International Dictionary of English v.0.48

Telethermometer \Tel`e*ther*mom"e*ter\, n. [Gr. ? far off + E.
   thermometer.] (Physics)
   An apparatus for determining the temperature of a distant
   point, as by a thermoelectric circuit or otherwise.
   [1913 Webster]