Brake Fluid Moisture Tester Brake fluid (Brake oil) is used in the brake fluid system to stop car wheel rotation. Its fluid type and quality influence driving safety directly. Brake fluid moisture testing is very important, if the brake fluid has exceeded moisture, it must be replaced to ensure driving safety. Clean before use: It is necessary to wipe clean the probe before performing the test, to avoid reading the residual brake fluid from the previous test. Test range of oil products: DOT3, DOT4, DOT5.1 Test range: 0.1% ~ 6% Test results analysis: 1. < 1%; brake fluid in good condition. 2. 1% ~ 2.5%; warning, status is OK. 3. 2.5%~3%; flashing orange light and intermittent weak alarm sound, indicating that the brake fluid product is in a poor state. 4. ≥3%; the screen flashes red light, indicating that the water content of oil products is in a bad state. 5. 4%; red flash, and a continuous sound alarm sound. Prompt for replacement. Language: English Backlight: Yes Alarm: Yes Automatic power-off: Auto off in 5 minutes when device idles Test time: 0.5 seconds Test mode: Basic mode Power supply: 9V Alkaline battery Working temperature: -10°C~50°C Tube: Metal gooseneck (soft metal tube)