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Usage Instructions: 1) Remove cap from brake fluid reservoir; 2) Remove probe cap from brake fluid tester; 3) Press power button on top of tester. Green LED lights up; 4) Dip entire length of metal probes into brake fluid; 5) After one second, match color of LEDs with color chart to determine brake fluid quality. Tester automatically powers off after twelve seconds of inactivity. The LED lights will indicate the percentage of water in the brake fluid: - Green: None. - Green/Yellow: Less than 1%. - Green /Yellow/Yellow: Approx. 2%. - Green/Yellow/Yellow/Red: Approx. 3% (Time to change brake fluid.). - Green/Yellow/Yellow/Red/Red: Approx. 4% (Change brake fluid immediately!). Please note: - Replace the battery if the green LED light no longer lights up after you press the button. - Wash the test probe with tap water after every use. - In case of skin contact with brake fluid, thoroughly wash the affected skin or clothing with water. - Do not expose brake fluid to the atmosphere for a long time as it is highly hygroscopic.