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Main Features:

• All the green lights indicate the brake fluid is fine, the water content is below 0.5%
• Yellow light indicates the fluid is not so good, the water content is above 0.5%, you can choose to change brake fluid.
• Red light with buzzer sound indicates the brake fluid is very bad, water content above 2.5%, the brake force decline seriously, and brake fluid should be changed.

Note:

If four indicators twinkle simultaneously with buzzer sound, it means the battery power is low, and the battery need to be changed.(voltage:9v). Or powered by the automotive battery(12v) through DC input socket(12v)