Hand-held refractometers, also known as hand-held refractometers, are instruments that measure the refractive index nD and average dispersion nF-nC of transparent, translucent liquids or solids (where transparent liquids are predominantly measured). Refractive index and average dispersion are one of the important optical constants of a substance, and can be used to understand the optical properties, purity, concentration, and dispersion of a substance.
The instrument can also measure the percentage of sugar content in the sucrose solution. This kind of instrument is widely used in petroleum industry, oil industry, paint industry, food industry, daily chemical industry, sugar industry and geological survey. It is one of the indispensable equipments used by factory schools and research institutes.