Product material: stainless steel, ABS Carry it with you and use it anywhere, equipped with a pocket clip for easy carrying of the tire tread depth gauge.With clear digital identification for easy testing, use cylindrical measuring ruler for more accurate testing.Measuring depth range is 0-25mm, which can be measured accurately and has a high practicability. Universal type, it can be used for vehicle tires. Instructions: 1. Push the probe in all the way; 2. Then place the black flat seat on the tire tread surface;3. Push the size to the end to see if the reading value is normal. Note: The red zone means that the tire must be replaced; the yellow zone means that the tire is about to be replaced; the green zone means that the tire is used normally. Delivery quantity: Four pieces