The Reichert Brake-Chek Brake Fluid Tester precision optical instrument determines the boiling point and water content of DOT3 and DOT4 brake fluids. Portable with no power cords, the Brake-Chek requires only one or two drops of fluid from the wheel master cylinder or master cylinder. An easy-to-read scale shows boiling point and water percentage, while a 10x focusable eyepiece comes attached for easy viewing. The test requires no heating of the sample, so no dangerous chemicals are inhaled by the operator.