Premium Quality: Made of ABS and stainless steel, durable, rustproof and lightweight, and easy to carry. Intelligent Color Coding: Clearly shows the different stages of the tire through 3 different color areas, helps you quickly measure and read data. Marking Range: Depth Range: 1 or 32" (1-25mm). Red zone: 0-3 or 32 inches (0-3 mm), representing the tire to be replaced. Yellow area: 4 or 32-5 or 32 inches (3-5 mm), representing a warning about to be replaced. Green area: 6 or 32-32 or 32 inches(5-25mm), representing normal use. Easy to Use: Push the probe all the way in before use, then place the black flat seat on the tire tread and push the size down to get the data. Precise Measurement: It can accurately measure different tread depths, suitable for most cars, trucks, motorcycles, etc.