The RX-7000a is an excellent refractometer which allows direct reading of refractive index, temperature-corrected refractive index and temperature-corrected Brix of various liquids. The prism is a durable sapphire prism which is scratch and corrosion resistant and assures a sustained high-reliability measurement. It is best for measuring oils and fats of high melt point, higher refractive index perfumes, organic solvents, etc. The RX-7000a has manual calibration which compensates for the difference in standard liquids and measurement values by other refractometers. 120 VAC.