Practical: 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.Durable: The stainless steel metal case is to avoid rust causing the use of the probe to retractable.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.3 different colors of areas on the bar show you a clear result of your tyre condition, providing simplicity and convenient for you.Red range on bar: 0-3/ 32; Yellow range on bar: 3/ 32 - 6/ 32; Green range on bar: 6/ 32-32/ 32; Different colors coded adding simplicity and convenience.Depth range: 1-25mm.Red area: 0-3mmYellow area: 3-5mmGreen area: 5-25mmMeasure Tire Tread Depth:Push the measuring scale into the gauge as far as it will go.Place the probe into the center of a circumferential tire groove and push down on the gauge's base.Carefully remove gauge by holding its barrel (without touching the probe) and confirm the tread depth reading.Place the probe into additional locations around the central circumferential tire groove at least 15 inches apart and repeat.Place the probe into the inner and outer circumferential grooves and repeat.Average all readings.Identify the percentage of tire wear by confirming the tire's /new tread depth in its specs compared to the remaining tread depth just measured.Material: Stainless steel + ABScolour:SilverPackage Contents:10 * tread depth gaugeOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.