1. To check the quality of brake fluid.
2. 3 LEDs to indicate percentage of water in the brake fluid.
3. Battery= 1.5V AAA.
4.Suitable for DOT4.

1. LED Green:
Brake Fluid H2O〈1.5％
Brake fluid O.K./ Battery O.K.
2. LED Yellow: Brake Fluid H2O＝1.5％-3％,
Low percentage of water. Check again within 6 months.
3. LED Red: Brake Fluid H2O〉3％, Change Brake Fluid