Source : Webster's Revised Unabridged Dictionary (1913)

Telemeter \Te*lem"e*ter\, n.
   An apparatus for recording at a distant station the
   indications of physical instruments such as the thermometer,
   galvanometer, etc.

Telemeter \Te*lem"e*ter\, n. [Gr. ? far + -meter.]
   An instrument used for measuring the distance of an object
   from an observer; as, a telescope with a micrometer for
   measuring the apparent diameter of an object whose real
   dimensions are known.

Source : WordNet®

telemeter
     n : any scientific instrument for observing events at a distance
         and transmitting the information back to the observer