Features: Ensure driving safety with the Brake Fluid Tester Pen, a highprecision tool for accurately detecting brake fluid quality. Featuring advanced sensor technology, this compact and portable pen quickly and accurately measures the moisture and quality of brake fluid. Designed for all car owners, especially those who prioritizedriving safety, as well as professionals in the automotive maintenance industry. Use it during regular car maintenance or emergencysituations, such as long distancedrives or road trips, to easily check and maintain the brake system. With its durable construction and waterproof design, the Brake Fluid Tester Pen is a reliablecompanion for ensuring the optimalperformance of your brake system. Specifications: Material: ABS, Electronic Component Testing Range: 0-4% Auto Off: 5Mins Working Temperature: 0-40℃ Battery: 2x1.5V AAA(NOT Included) Size: Approx. 23x174mm/0.9x6.8in Package Includes: 1x Tester Pen note: Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item.