Review on Outus Color Tread Depth Gauge by Derek Cage

They are inexpensive and easy to read. I recommend having one in the garage for checking tires on cars. However, these are wrapped stickers. They break off when exposed to heat/fat. The ones we use in the shop are engraved with numbers so oil/thinner doesn't hurt. Yes, over time the ink will fade and they will scratch. For everyday home use, they are unbeatable. If you are a pro mechanic, skip these and get to pro level.