A DIGITAL BRAKE FLUID TESTER is indispensable in every car workshop or garage, it allows you to quickly and accurately check the quality of the brake fluid. The tester measures the percentage of water in the brake fluid. Brake fluid must not contain more than 2% water.

Users manual:

Green diode - no water in the brake fluid

Yellow diode - less than 1% water in the system

Two yellow diodes - 2% water in the system ( content within normal limits )

Red diode - there is 3% water in the system ( it is recommended to change the liquid )

Two red diodes - more than 4% water in the system ( you need to change the brake fluid )