Review on Accurate and Convenient Tire Tread Depth Gauge Tool by Preciva, LCD Display, Inch and MM Conversion (0-0.98 Inches) by Dan Ball

This depth gauge is incredibly easy to use. The buttons remind me of my digital calipers. Unpack, remove plastic strips to power it up, and off you go. It even comes with an extra battery! The transducer is very easy to zero and displays depth in inches or millimeters. One thing I don't like is that it turns on when you move it, even a little (like moving it). It would be better if it only responded to the power button, but that doesn't matter given the simplicity of its job.