The Brake Fluid Tester Pen DOT 3 4 5 LED Display Test for Water, It is a compact and lightweight tool designed for testing brake fluid in motorcycles and passenger vehicles. With a weight of 80g, it is easy to handle and carry around. The LED display provides clear and accurate results, making it a reliable tool for ensuring the quality of your brake fluid. Perfect for workshop use or for the home mechanic, this single item tester is a must-have for any garage or vehicle maintenance facility. 1x AAA Battery included.