1The brake fluid tester, with a high?precision sensor, has accurate detection results, can effectively detect the state of the brake fluid, and provide you with a safer driving guarantee. 2With a 3?color Lcd high?resolution display, you can understand the details and test results more clearly. DOT3 indicates that the purity is less than 1%, DOT4 indicates that the state is less than 2%, and DOT5 indicates that the state is more than 4% and must be replaced. 3There are anti-skid designs on both sides, which can be operated with one hand. The operation is simple, bringing you more convenience, supporting multi-fluid testing, and better meeting your needs. 4Replaceable battery design, more convenient and faster to use, universal probe design, sturdy, corrosion?resistant, and long service life 5With alarm sound design, when the moisture content of the brake fluid exceeds the standard, an alarm will be issued to replace the brake fluid.