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Checks moisture content of fluid by measuring the electrical resistance and comparing it with acceptable limits. Calibrated for cars using DOT 4 brake fluid only (found in most cars produced since 2006),
Press the button for power on, green LED will light up.
Insert the tester into reservoir for a second, then the results will be indicated correctly by LEDs.
Auto power off.
Uses 1.5V AAA cell (not supplied).
Green: battery ok, i.e. no water contained in the brake fluid.
Yellow: less than 1% of water content in brake fluid.
Yellow/yellow: approximately 2% of water content in brake fluid.
Yellow/yellow/red: approximately 3% of water content in brake fluid;
-The brake fluid should be changed.
Yellow/yellow/red/red: at least 4% of water content in brake fluid;
-The brake fluid must be changed urgently, extreme danger.