KINGBOLEN BF200 Brake Fluid Tester with Screen display for DOT3, DOT4, DOT5.1. BF200 Brake Fluid Tester Support DOT3 /4/ 5.1. To DOT3: lower than 1% High Purity. Test Range: DOT3、 DOT4、DOT5.1. BF-200 Brake Fluid Tester is a convenient automotive tool,universal fit for most vehicle.High precision to test DOT-3, DOT-4, DOT-5.1 brake fluid.Test the car brake fluid quality quickly, which can remind you to change the brake fluid.Only takes seconds to know the results,very easy to use.