VEE GEE Abbe Refractometers are an excellent, lower-cost choice for liquids testing or when solids testing is required. Feature Brix% and Refractive Index (nD) scales. Dispersion Value (nF-nD) and Abbe Number [(nD-1)/(nF-nC)] can be calculated with included charts. For measurement of liquids, glass, plastic, & film. Backed by a 1-year warranty. Large, easy-to-use controls. Circulator nozzles for prism temperature control.