It is specially designed to measure the depth of the anti-slip tread of various wheels, so as to ensure the safety of tyre wear. Accurate Measurement The reading is clear and the alert value is particularly clear, the cylindrical measuring rod, test more accurate. Tiny Small size, easy to carry and store. EASY USE With simple use, push the probe straight up to the end, and then you can measure the black flat surface on the tire pattern. Durable The stainless steel metal case is to avoid rust causing the use of the probe to retractab Specification Type:Tyre Depth Gauge Material: Stainless Steel, ABS, Color: Silver Depth range: 1-25mm. Red area: 0-3mm Yellow area: 3-5mm Green area: 5-25mm Item Size: 8.76*2.77*1.28cm/3.4*1.1*0.5Inch Net Weight: 10g/0.35oz Note Red zone representative: to change the tire. Yellow district representative: warning is about to be replaced. Green zone representative: use normal. -Due to the light and screen setting difference, the item's color may be slightly different from the pictures. -Please allow slight dimension difference due to different manual measurement.