Reichert Analytical Instruments Abbe Mark II Plus Refractometers provide a digital data readout in 3 modes. Scales include % solids, temperature compensated % solids and refractive index. A focusable eyepiece and dispersion correction prisms are standard features for easy, precise operation. An adjustable, built-in focused illumination system eliminates the need for transformers and extra illumination. An operator simply places a small drop of sample on the measuring prism surface and adjusts the light source.