Review on Outus Color Tread Depth Gauge by Kenneth Wood

I had an old profile gauge with no color designation. It worked, but you wasted more time reading the actual depth. So you can quickly read whether you are still in the black. If you see yellow or red, you'll know quickly that you should start buying a new set of tires. If you want actual tread depth, the numbers are easy to read beyond a quick initial status reading.