This digital brake fluid tester is a universal fit for most vehicles and is suitable for DOT 3, DOT 4, and DOT 5.1 brake fluids. It features a high-resolution backlit LCD display for easy reading of data, even in the dark. The tester also includes an analogue graph and quickly checks the water content in the brake fluid. It is equipped with a highly sensitive stainless steel flexible test probe. The built-in alarm signals when the water content exceeds the limit, and the alarm can be muted if necessary. The tester is powered by a 9V battery (available separately) and includes a low battery warning.