Features
1. To check the quality of brake fluid quality.
2. 5 LEDs to indicate percentage of water in the brake fluid.
3. Automatically power off.
4. Operated by a LR03 AAA 1.5V battery.
5. Press the button for power on, green LED will light up.
6. Insert the tester into reservoir for a second , then the results will be indicated correctly by LEDs.

Indications:
1. Green: Battery OK, i.e.: No Water Contained in the Brake Fluid.
2. Yellow: Less than 1% of Water Content in Brake Fluid.
3. Yellow/Yellow: Approximately 2% of Water Content in Brake Fluid.
4. Yellow/Yellow/Red: Approximately 3% of Water Content in Brake Fluid. The Brake Fluid Should be Changed.
5. Yellow/Yellow/Red/Red: at least 4% of Water Content in Brake Fluid. The Brake Fluid Must be Changed Urgently, Extreme Danger.