The refractometer is a measuring device for determining the refractive index of - liquid or solid - transparent materials by refractometry. It uses the behavior of light at the interface between a prism with known properties and the substance under test. If the general composition of a liquid is known, a refractometer can be used to measure the concentration. In connection with the harvesting of sugar beets or wine in this manner, the sugar content of plants is determind. (Source: wikipedia) UP Umweltanalytische Produkte GmbH offers pecialized solutions for collection refractometer-measurements by the Fruitsoft-Database either through keyboard or RS-232-interface. About the companyUP Umweltanalytische Produkte GmbH also offers devices to measure colour, firmness, size, starch and sugar, as well as software to evaluate fruit quality. Special solutions for cherry and other soft fruits (berries).