This is essential to obtain evidence as to the precise condition of the brake fluid and , in turn , the functional status of the entire braking system . If the water content is excessive , pockets of steam may form , leading to a brake failure.   Features: The purpose of the brake fluid tester is to measure the amount of water contained in brake fluid.  The LED indicators will show percentage of water in the brake fluid with 3 colors green yellow and red.  Measurement range from (0-3%) moisture contain in the Brake fluid.  Test the car brake fluid quality quickly to check whether it’s qualified, which can remind you to change the brake fluid when necessary to avoid traffic accident.  Power supply: 3 piece 1.5V LR44.   Specification: If the green test indicator LED lights up, the water content in the brake fluid is less than 1.5% and the brake fluid is all right.  If the yellow test indicator LED lights up, the water content in the brake fluid is between 1.5% and 3%; the brake fluid can still be used at present, but if you want to continue using the brake fluid, you must often check the brake fluid.  If the red test indicator LED lights up, the water content in the brake fluid is more than 3% and the brake fluid must be changed immediately.  Package size:25x5x3m;  Package weight:71g;   Package Included: 1x Brake Fluid Tester Pen