This pen-shaped brake fluid tester can easily help determine whether it's time for you to change your brake fluid. Staying safe and that your is in condition. Therefore, it is a great tool for testing brake fluid for your . Features - Brand: LEORX. - Color: Black. - Material: Plastic, metal. - Size: 15 * 2.2 8 2.2cm(L * W * H). - Help determine whether it's time for you to change your brake fluid. - Great tool for testing brake fluid for your . What to do 1. Turn on the brake fluid tester by pressing the button. A green light should light up. If the light does not come on, it may be time to change a battery. 2. Unscrew the lid for the brake fluid reservoir, and take off the for the brake fluid tester. 3. Dip the test probes into the brake fluid and the lights will indicate the percentage of water in the brake fluid. 4. After testing, remember to screw the lid of the brake fluid reservoir back on tightly. 5. The tester will automatically power off after of inactivity. The lights will indicate the percentage of water in the brake fluid: - Green: None. - Green/Yellow: Less than 1%. - Green /Yellow/Yellow: Approx. 2%. - Green/Yellow/Yellow/Red: Approx. 3% (Time to change brake fluid.). - Green/Yellow/Yellow/Red/Red: Approx. 4% (Change brake fluid immediately!). Note - This brake fluid tester is calibrated for DOT 4 brake fluid only, which is used in most produced . - Replace the battery if the green light no longer lights up after you press the button. - Wash the test probe with tap water after every use. - In case of skin with brake fluid, thoroughly wash the affected skin or clothing with water. - Do not expose brake fluid to the atmosphere for a long time as it is highly hygroscopic. Package list: 1 * LEORX Brake Fluid Tester Detector (Black)