Grackel

That's not what I'm after, I know how to zoom in and edit images. What I'm looking for is making it so I can just measure in mm rather than cm. It's not a huge thing, but it would take a few seconds off each measurement. This is what I would like to see, but with mm as an option.

So, in the bottom of the window there's a small section that shows your ppi or ppcm, relative to your canvas (i use this to make plans for projects), but is there a way to perhaps see millimetres there instead of centimetres? Might be a dumb question, but I couldn't find anyone else asking or mentioning this. Thanks.