colorimeters

/K AH0 L ER0 IH1 M AH0 T ER0 Z/
noun
  1. 1

    Any of various instruments designed to determine the color of something, by comparison with standard colors or by spectroscopy.

  2. 2

    An analytic instrument that estimates the concentration of a substance in a sample by measuring its color against the solution's complimentary color.

Source: https://en.wiktionary.org/wiki/colorimeter, https://en.wiktionary.org/wiki/colorimeters