The best way to monitor tread wear is with a  Depth Tread Gauge. The gauge can detect a wear pattern sooner than visibly looking at the tread. Unusual wear patterns in the tire can be caused by incorrect air pressure, loose or worn steering parts, driving patterns, load conditions, etc. When a wear pattern is detected using the Tread Depth Gauge, you can search for the cause before excessive tread wear occurs or the tire is ruined.

Range: 25mm*0.01/1in*0.0005
Accuracy: 0.02mm
8mm high LCD display.
Zero setting at any position.
Metric/Inch system interchange.
Manual power on/off.
Suitable for Tread Depth, Brake Shoe and Pad Wear.