The Extech RF12 Portable Brix Refractometer measures the concentration of lubricants and cutting fluids. Compact and easy to operate, it requires only 2 or 3 drops of solution and provides accurate and repeatable measurements on an easy to read scale. The RF12 features a prism and lens with a simple focus adjustment and automatic temperature compensation (ATC) from 10°C to 30°C. Comes complete with case, calibration screwdriver, plastic pipette, and calibration solution.