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What does refractometer measure?

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User Volcano
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It measures the refractive indices of gases.
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User Oschrenk
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A refractometer is an instrument used to measure the refractive index of gases, liquids, and translucent solids like gemstones. Liquids are tested for things such as blood proteins, salinity, fluid concentrations, and specific gravity of urine.
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User Gutenberg
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