The Collaborative International Dictionary of English v.0.48:

Tintometer \Tint*om"e*ter\, n. [Tint + -meter.] (Physics)
   An apparatus for the determination of colors by comparison
   with arbitrary standards; a colorimeter.
   [Webster 1913 Suppl.]

WordNet (r) 3.0 (2006):

tintometer
    n 1: a measuring instrument used in colorimetric analysis to
         determine the quantity of a substance from the color it
         yields with specific reagents [syn: colorimeter,
         tintometer]