Car Brake Fluid Tester DY23B Accurate Test Automotive Brake Fluid Water Content Check Universal Oil Quality DOT 3/4/5

DUOYI DY23B automotive brake fluid tester with LED digital indicator check DOT3 DOT4 DOT5 car oil quality     Why We Must Have -- Brake pressure was transmitted by brake fluid, the pressure transmission will out of function once brake fluid including too much water. In order to safe-driving, we must test water ratio scale in brake fluid regularly. The brake fluid tester help us do current maintenance, make sure we drive in safety condition.   Operation Manual: 1. Install one 9V(6F22) battery at the back of tester.2. After inserting the battery, press POWER button to turn on the tester, all LEDs lights turn on with buzzer sounding, which indicates the product self-test is successful.3. Press SELECT button, it will locate DOT3 model automatically.4. Each time you push the SELECT button, it will recycle from DOT3 to DOT4 to DOT5.1 with the indicator LEDs.5. Immerse the probe into brake fluid and you will get different colors of LED lights, they indicate:Green Light: indicates the brake