Use case

Simply print a handful of these tiny and quick to print parts and spread them around. It comes handy to quickly check your tires once in a while, to see if you have the minimum profile that is required where you live. The numbers on each side state the length of the respective probe pin in millimeters.

For a much more advanced way of measuring you tire profile depths see:
https://www.printables.com/model/161506-dial-gauge-for-tire-profile

If you don't trust the length of the probe pins, there even is a calibration and check tool for tire profile gauges:
https://www.printables.com/model/161523-calibration-tool-for-tire-profile-gauge

Printing

This is a very simple to print part. I have tested it in PETG but I am sure it works just as well in PLA. As it is so tiny anyway, I do recommend 100% infill to make the probe pins strong.

You may want to introduce a color change to have the numbers printed in a different color. I have chosen to simply post-color the numbers with a black pen (edding 3000).