Practical: With alarm sound design, when the moisture content of the brake fluid exceeds the standard, an alarm will be issued to replace the brake fluid. Excellent Performance: The brake fluid tester, with a highprecision sensor, has accurate detection results, can effectively detect the state of the brake fluid, and provide you with a safer driving guarantee. Premium Quality: With a 3color LCD highresolution display, you can understand the details and test results more clearly. DOT3 indicates that the purity is less than 1%, DOT4 indicates that the state is less than 2%, and DOT5 indicates that the state is more than 4% and must be replaced. Advantage: The nonslip design on both sides can be operated with one hand. The operation is simple and brings more convenience to your inspection work.