A portable Brix refractometer is a handheld device used to measure the concentration of sugar in a liquid, typically in aqueous solutions. The term "Brix" is a scale that indicates the percentage of sucrose (sugar) by weight in a particular solution. The refractometer operates on the principle of light refraction. When light passes through a liquid, its speed changes based on the density of the liquid. The refractometer measures this change in the direction of light. A small sample of the liquid (usually a few drops) is placed on the refractometer's glass surface, which is often called the prism.Brix range-0.0 ~ 50 %;Refractive index-1.3330 nD ~ 1.4200 nD;Temperature-0 °C ~ 50 °C;for more visit labtron.us