Feature: 1. Carry it with you, easy to use. 2. Clear numbers and different colors are convenient for testing. 3. Use a cylindrical measuring rod to test more accurately. Specification: Size: 9x2.5cm/3.54x0.98in Suitable for: General purpose Instructions: 1. Push the probe up to the end 2. Place the black flat seat on the tire tread 3. Push the size down to the end and check the value The meaning of the color: Red zone: 0-3mm0-3/32, need to be replaced Yellow area: 3-5mm4-32"-5/32" warning, will be replaced soon Green zone: 5-25mm6/32"-1", normal Note: Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you Please allow 1-2mm measuring deviation due to manual measurement. 2 X Tire Ruler