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A colour measuring device for measuring/comparing colours.
It is often used for the calibration of monitors or in biology/chemistry for analysis. More powerful devices, such as the spectrophotometer, can measure colours spectrally and are also used, among other things, for proofs 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.
Colour measurement is used to determine the exact colour location of a colour in a colour system.
Spectral photometers (or spectrophotometers) are high-quality colorimeters that can measure and accurately describe any colour.