RHA-503ATC Refractometer for Glycol analysis / testing Quad-Scale Antifreeze Refractometer Reads Ethylene Glycol, Propylene Glycol, Windshield (Windscreen) Fluids and Battery Acid Strength It will tell you: Freeze Point of Ethylene and Propylene Glycol & Windshield Fluid Battery Acid Concentration in kg/l This unit reads in Celsius ONLY! NOT Fahrenheit, sorry...