An instrument for comparing intensities of colour
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Commutator
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Colorimeter
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Crescograpgh
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Chronometer
B
Correct answer
Explanation
A colorimeter is an instrument that measures the intensity of colour by analyzing the absorbance or transmittance of light through a solution. It's used in chemistry and physics to determine concentration of colored solutions. Commutator is part of an electric motor, crescograph measures plant growth, and chronometer measures time.