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A colour measuring device for measuring/comparing colours.
It is often used to calibrate monitors or in biology/chemistry for analyses. More sophisticated devices, such as the spectrophotometer, can measure colours spectrally and are also used for proofing to verify or calibrate printers.
Colorimetry, or colour theory, is the science of colour.
It is primarily concerned with an objective and measurable evaluation and definition of colour valences (the visual perception of colour), as well as their relationships to one another.