Digital tire tread depth gauge.
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Previously:
https://www.homemadetools.net/forum/...461#post181863
https://www.homemadetools.net/forum/...009#post179849
https://www.homemadetools.net/forum/...024#post153218
https://www.homemadetools.net/forum/...724#post167262
https://www.homemadetools.net/forum/...602#post166898
https://www.homemadetools.net/forum/...952#post133775