Brake Fluid BF100 Tester Diagnostic Tool Inspection Detector For DOT3 DOT4 DOT5.1 71g Condiiton: Item Type: Brake Fluid TesterMaterial: Industrail Grade ABS Color: Black.Display: Three-Color Led Display Power Supply Battery: 2 x AAA Battery (Not Included) Detection Range: DOT3, DOT4, DOT5, DOT5.1 Working Temperature: 0-50℃ Product Size: Approx. 171 x 39 x 22mm/6.7 x 1.5 x 0.9in   Product Weight: Approx. 71g/0.2lb Vehicles Used: All VehiclesInstruction: How much do you know about brake fluid? All drivers know how important brake fluid is when driving, and it is directly related to vehicle safety and personal safety, which is why the automotive industry. This is why many people describe brake fluid as a "security guard". The general brake fluid replacement cycle is 2 years. Brake fluid itself is very absorbent, and will absorb moisture in the surrounding air, such as car wash, humid air, etc. Which will directly cause the quality of the brake fluid to decline and may lead to accidents. Such as rear accident, vehicle runaway, traffic accident.BF 100 brake fluid teste descriptionr: Red brake fluid with a water content of at least 4% Red brake fluid with a water content of about 3% Yellow brake fluid with water content of about 2% Yellow: Brake oil with less than 1% water content Green: Anhydrous in good condition LED display description: Green: The current test brake fluid is in good condition. Green/Yellow: The water content of the brake fluid is less than 1%. The brake fluid has good performance and can be used with confidence. Green/Yellow/Yellow: Brake oil with a water content of about 2%, it can still work. Green/Yellow/Yellow/Red: The content of brake fluid is about 3%. It is recommended to replace the brake fluid. Green/yellow/yellow/red/red brake fluid, at least 4%, can be replaced.