Brake fluid tester pen designed to test moisture content of DOT3, DOT4, DOT5, ENV6 and ENV4 brake fluids, suitable for most cars and light vehicles.
Simply immerse the tester pen into the brake fluid reservoir to get instant, reliable readings.
Clear LED display shows brake fluid condition at a glance: green for good, yellow for caution, and red indicating immediate fluid change.
Easily figure out the percentage of water in your brake fluid and consider whether to replace it.