Shoutout to the guy at the Denver co-op who showed me my chain checker was lying
I spent 6 months replacing chains on customer bikes at 0.5 wear because my $12 checker said they were stretched, and nobody questioned it. He put a steel ruler on one of my "worn" chains at the shop on Broadway and the pins lined up dead on, which meant my checker was off by almost a full half percent. How many chains did I cost folks before somebody finally called me on it?
Wait, you were out here charging people for new chains based on a $12 piece of junk that couldn't even measure straight? That's wild. Sounds like that checker was less of a tool and more of a random number generator. Honestly though, the real crime is that nobody at your shop ever double checked with a ruler before you swapped out half the bikes in Denver. Six months of this and not one customer came back like "hey my chain feels exactly the same as before"? That's some next level trust right there.