Item: Brake Fluid TesterCar Maker: AudiItem Height: 7 cmLanguage: EnglishExternal Testing Certification: CEItem Length: 15cmItem Weight: 0.1 kgPower Supply: 1 x 1.5V "AAA" Battery (Battery not Included)5 LEDs indicating the water % in the brake fluid:0% light indicates that the battery is OK， no replacement1% light indicates that moisture content of brake oil less than 1% ， brake fluid has a good performance， and ease of use.2% light indicates that moisture content of brake oil less than 2%， brake fluid can be continued to use3% light indicates that moisture content of brake oil less than 3% ， proposed to replace brake fluid.4% light indicates that moisture content of brake oil less than 4%， brake fluid should be replaced immediately.Unit Type: piece