All-in-One Brake Fluid Tester for Standard & High-Performance Cars: Works with DOT3, DOT4, DOT5.1, plus ENV4 and ENV6 – the fluids found in many imported and high‑performance vehicles. Whether you drive a daily commuter or a track‑ready machine, this digital brake fluid tester pen gives you accurate moisture readings across the board. No more guessing which fluid your tester supports. Flexible Gooseneck Probe for Tight Engine Bays: The front of the tester features a bendable gooseneck design that lets you reach brake fluid reservoirs in cramped, awkward, or deeply recessed locations. Easily maneuver around hoses, wiring, and chassis components – perfect for modern engine compartments where space is at a premium. Corrosion‑Resistant Metal Probe with High Precision: Engineered for repeated use in harsh brake fluid environments, the probe resists corrosion, scratches, and oxidation. Combined with factory‑calibrated ±0.3% accuracy, you get consistent, lab‑grade reliability without drifting readings. Clean it after each test and it stays like new for hundreds of checks. Smart Visual & Audible Alerts: Green backlight (0‑2% moisture) means fluid is safe; orange with slow beep (2‑3%) suggests replacement soon; red with rapid beep (above 3%) signals immediate action. The clear display also features data hold, a built‑in work light, and auto shut‑off after 5 minutes – powered by two AAA batteries with low‑battery warning. Complete Kit with 3‑Year Warranty: Includes batteries, user manual, and a 3‑year warranty. Compact, lightweight, and ready for DIYers and professional technicians alike. Trust this digital calibrated sensor to keep your brake system safe, responsive, and reliable – from routine maintenance to performance vehicle care.