A refractometer is a laboratory or field device for measuring the index of refraction (refraction). The refractive index of a given sample varies for nearly all materials for different wavelengths. This dispersion relationship is characteristic of all materials. Temperature has a very important effect on refractive index measurements. Therefore, the temperature of the prism and the temperature of the sample must be controlled with great precision. Uses of refractometers: - Alcohol industry: Measure the density before fermentation to determine the amount of sugar. - Urology - Measurement of protein in the blood, measurement of urine weight -Human medicine - Measurement of urine weight - Beverages - Measurement of sugar in aqueous solutions -Gemology-Determination and quality characterization of gemstones -Gemology locomotive industry-Measurement of freezing point of battery cooling liquid -Aquarium- Measuring salinity of water
