【High Quality】: The shell of this car brake fluid liquid texter pen is manufactured from high-quality plastic, ensuring it is sturdy and resistant to scratches and abrasion, making it suitable for long-term use. Its probe is made of brass-plated metal, ensuring it is corrosion-resistant and quick to respond.

【Practical Function】: This brake fluid testing pen is designed to professionally test the condition of your vehicle's brake fluid. You can use this product to know the condition of the brake fluid, and replace the brake fluid in time, ensuring the safe operation of your brake system.

【Portable Design】: Featuring a portable pen clip design, the compact and lightweight clip measures approximately 5.98 x 0.79 inches and weighs 27g. This makes it easy to store and carry in your pocket without taking up too much space, and it is convenient to access whenever required.

【Easy to Operate】: First, unscrew the brake fluid reservoir cover and remove the test pen cap. Next, press the on button and the green LED will light up. Then, insert the test probe into the brake fluid. After that, read the result through the LED indicator. Finally, press the button again to switch off the power.

【Scope of Application】: This versatile brake fluid tester is specifically designed to test the water content of DOT3, DOT4, and DOT5.1 brake fluids. The product is compatible with AAA batteries. Please note that batteries are not included in the package and must be purchased separately.