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. 23‑color LED display, the status of level 5 brake fluid, the indicator light is green to show that the current brake oil is in good condition. When the yellow light is less than 1%, the brake oil can still work. When the light is red, the brake fluid The content is about 3%, it is recommended to replace the brake fluid. 3The non?slip design on both sides can be operated with one hand. The operation is simple and brings more convenience to your inspection work. Nickel?plated metal probe, oil resistance, oxidation resistance, good conductivity, high precision, can be quickly measured. Universal probe, rugged, easy to use and flexible. 4Widely used and supports different brake pads of DOT3, DOT4 and DOT5.1. Simple but practical, single button with multiple functions. Press and hold for 3 seconds to turn on/off, press and hold for 2 seconds to turn on/off the flashlight, press once to select the oil type. 5Made of industrial grade Abs material, durable, not easy to wear, has long service life, suitable for all car inspections, bringing you more convenience.