\"Specification:1, Check the quality of car brake oil2, 5 LED lights indicate the percentage of moisture in the brake fluid3, Automatic power off4 LR03 AAA batteries (not included)Tester Instructions:The brake fluid detection pen is based on the change of conductivity to determine the change of moisture in the brake fluid. It clearly shows the extent of moisture contained in the LED, high water content will lead to a lower boiling point and affect braking performance. Red indicates that the brake fluid should be replaced immediately, green indicates good condition, yellow indicates that the condition is acceptable but should be replaced soon.1, Green light turns on = Water content in brake fluid H2O 3%, can not continue to use the brake fluid needs to be replacedRed LED: change the brake fluid4, red LED flashing: battery replacement5, yellow LED: low moisture content, check again in six months6, green LED: brake fluid lines / cell rowTester Features:Five LED indicators show that the test results are more accurate.Test DOT 3, DOT4, DOT5 brake fluidPress the switch to turn on the power, the green light that represents the battery correctly, the green light does not light up to replace it. To replace the battery Automatic shutdown Technical parameters: Green: Battery OK, brake fluid does not contain water Green / yellow: brake water content less than 1%, better performance of brake fluid, easy to use. Green / yellow / yellow: brake water content is about 2%, brake fluid can continue to be used. Green / yellow / yellow / red: brake water content about 3%, brake fluid replacement suggestion. Green / yellow / yellow / red / red: brake water content at least 4%, brake fluid must be replaced immediately responsible for very dangerous.