Brake fluid testing pen is professional and practical to use, simply insert the pen into the brake fluid reservoir and wait for the results. The device is battery-powered, but are not included. With this brake fluid testing pen, you can ensure that your brakes are safe, giving you peace of mind on the road. Features -Color:Black -Material:Copper and plastic -Size:15.60X2.50X2.00cm/6.13X0.98X0.79in -Note: Battery is not included. (1 x AAA battery) - Brake fluid analysis pen, can be used as a brake fluid tester, suitable for determining brake fluid quality. - Brake fluid tester is designed for precise determination of brake fluid condition. - User-friendly design, handheld brake fluid tester makes it easy to use for anyone. - Wide range of applications, suitable for testing in various vehicles. - Brake fluid tester is built to last, crafted with plastic and copper materials to assure durability and prolonged usage. Package list: 1 x Brake Fluid Tester