Features: Length: about 85mm/3.35in. This hand device is designs to measure the amount of remaining on a tyre, soles . The tyer wear and tear in a limited lengetivity. This meter can tell us when it should be replaced by measure the attrition. Standard depth gauges. Specifications: Material: Metal+ Plastic Dimension: about 85mm/ 3.35in Color: Silver+ white Usage: 1. Push the probes up to the bottom 2, and then put the size black flat on the tire pattern 3, and then push the size down to end, read whether the value is normal. redness zone representative: to change the tire; Yellow area: warning is about to be replaced; The green area indicates that the service is normal Depth ranges: 1-25mm redness area: 0-3mm&0-3/32 Yellow area: 3-5mm&4-32"-5/32" Green area: 5-25mm&6/32"-1" Package Includes: 1xTyre Testor(without retail package) note: Please allow 1 to 3cm error due to manual measurement, please make sure you do not mind before you bid, Due to the differences between different monitors, the picture may not reflect the actual colorful of the item.