Pen Pro Refractometer is a handheld device mostly utilized for the measurement of the concentration of a liquid solution, like sugar in fruit juices, honey or wine. It is a compact and portable instrument that is convenient to use and provides accurate and quick results. It works by scaling the refractive index of a liquid, which is the degree to which light is bent as it goes through the liquid. This light bending is influenced by the concentration of dissolved solids in the liquid, like sugar. Pen Pro Refractometer is utilized in the food and beverage industry, and in agriculture and manufacturing as well.