Function:

* LED green: H₂O(in Brake Fluid)< 0. 5%, brake fluid is ok.

* LED yellow: 0. 5%< H₂O(in Brake Fluid)< 2. 5%, Low percentage of water, It check again within 6 months.

* LED red: H₂O > 2. 5%, It change brake fluid, LED red is flashing.