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refractometer
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refractometer

instrument
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Quick Summary

A refractometer is an instrument used to measure refractive indices. The refractive index is the ratio of the speed of radiation, such as light, in one medium compared to another. Refractometers are utilized for identification purposes or to determine the sugar content in a substance. The term "refractometer" was first used in 1842.12

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  2. refractive index

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