Product: Brake Fluid TesterItem length:15cmVoltage: 1.5VLanguage: EnglishExternal Testing Certification: CEItem Weight: 0.1 kgPower Supply: 1 x 1.5V "AAA" Battery (Battery not Included)Principle: according to conductivity changes to determine moisture change in brake fluid， with five different color LED indicatorIndicator Description: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.Note: Due to the difference between different monitors， the picture may not reflect the actual color of the item. Thanks for your understanding.Quantity: 1