Yeah well because I never did this before, I've read that you shouldn't measure your old to the new chain and my old chain was really dirty so I didn't check afterwards but it's not like it's more than half a link of difference right? The nail hanging trick is a good one to keep in mind, thanks!

Haha, the hooks made me laugh 😁 it's exactly what posts like these are meant for right 🙂
When I started cycling, I bought this chain wear tool from AliExpress, I was at the Mantel store in Utrecht yesterday and bought a proper Parktool one which measures 0.5 on one side and 0.75 on the other, strange thing is,both the Shimano as the BBB checkers measure 0.75 and 1.0 wear, which already is way too much.

I haven't tested if there's any difference between the AliExpress tool and the Parktool one, I will measure them tomorrow when I have some time.