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. Specifications: Refractive Index Range (nD): 1.3250-1.7000, Refractive Index Scale (nD): 0.0001, Refractive Index Accuracy: 0.0001, Brix Range: 0.0-95.0%, Brix Scale: 0.50%, Brix Accuracy: 0.10%, Temperature Range (ATC): 5-70° C, Shipping weight: 20 Lbs.