【Precision Detection】The brake fluid tester's probe features a high-precision sensor for accurate water content detection. It analyzes fluid in seconds and displays instant results, clearly indicating when replacement is needed. 【Normal & Expert Mode】The PLAYOCCAR brake fluid tester has two modes: Normal Mode, designed for everyday drivers to check standard DOT 3, DOT 4, and DOT 5.1 fluids, and Pro Mode, tailored for professional mechanics to test premium DOT 4 brake fluids from brands like MOTUL, ATE, FERODO, MOBIL, BREMBO, TRW, BOSCH, CASTROL, TOTAL, VALEO, and FUCHS 【Audible Alarm】If the water content is between 0% and 2%, the brake fluid is in good condition. A reading between 2% and 3% indicates a caution zone. If it exceeds 3%, you'll need to flush and replace the brake fluid immediately—the brake fluid tester will beep to alert you, ensuring your safety. 【Premium Materials】The brake fluid moisture tester's detection hose features a 304 stainless steel exterior that resists brake fluid corrosion and oxidation. Its 10.3-inch foldable probe rotates 180°, allowing easy access to hard-to-reach test points. 【Backlit LCD】The 2.8-inch backlit LCD screen ensures clear visibility of test results in any lighting condition。 【Probe & LCD】800mm probe for flexible testing. PTFE hose resists oil, oxidation, and corrosion, extending lifespan. 2.8 - inch LCD offers clear visibility in all light conditions.