Maintain your vehicles with a MISCO, made-in-the-USA, Fleet Maintenance Refractometer. One tool can test the urea content in Diesel Exhaust Fluid (DEF), concentration or freeze point of standard ethylene glycol engine coolant or new ELC extended life coolants, and even water content or boiling point of brake fluid in hydraulic brakes. Never has it been so easy to get a precise measurement of your vehicle’s fluids. A drop or two of fluid is all you need for an instant, accurate measurement