View larger Salinity Refractometer with Automatic Temperature Compensation Measures the concentration of dissolved salt in fluids. Compact size, easy to operate. Automatic Temperature Compensation (ATC) from 10 to 30°C. Other Features Provides accurate and repeatable measurements on easy to read scale. Requires only 2 or 3 drops of solution. The prism and lens with a simple focus adjustment. Includes Comes with case, calibration screwdriver, plastic pipette calibration solution, and user guide. RF10 Brix Refractometer 0 to 32 percent The Extech RF10 measures the concentration of sugar in fruit juice and industrial fluids from 0 to 32 percent Brix, with a maximum resolution of 0.2 percent Brix. It only requires two or three drops of solution, and the prism and lens with focus adjustment provides simple, repeatable measurements. The RF15 comes complete with carrying case and calibration screwdriver. RF15 View larger Brix Refractometer 0 to 32 percent with Automatic Temperature Compensation The Extech RF15 measures the concentration of sugar in fruit juice and industrial fluids from 0 to 32 percent Brix, with a maximum resolution of 0.2 percent Brix and automatic temperature compensation. It only requires two or three drops of solution, and the prism and lens with focus adjustment provides simple, repeatable measurements. The RF15 comes complete with carrying case and calibration screwdriver.