The Collaborative International Dictionary of English v.0.48:

Ebullioscope \E*bul"li*o*scope\, n. [L. ebullire to boil up +
   -scope.] (Phys. Chem.)
   An instrument for observing the boiling point of liquids,
   especially for determining the alcoholic strength of a
   mixture by the temperature at which it boils.
   [1913 Webster]