It's programmed for Diesel Exhaust Fluid (DEF / Urea %), model PA201X-185 Get laboratory-grade accuracy with the MISCO PA201X Palm Abbe Digital Refractometer. Built for reliable, quick, and precise fluid analysis, this handheld digital unit eliminates the guesswork of traditional analog refractometers. Featuring an easy-to-read digital display, ergonomic rubber armor sleeve, and automatic temperature compensation (ATC), it is ideal for industrial, automotive, or laboratory fluid testing.