Colorimeter
WordNet
noun
(1) A measuring instrument used in colorimetric analysis to determine the quantity of a substance from the color it yields with specific reagents
WiktionaryText
Noun
- Any of various instruments designed to determine the color of something, by comparison with standard colors or by spectroscopy.
- An analytic instrument that estimates the concentration of a substance in a sample by measuring its color against the solution's complimentary color.