We've been using that little red thing that says 42 to keep track of the grind setting on our hand grinder - just thought I'd share since it's been super useful.
It's a row counter for knitting. They're super cheap and at craft stores. I used them originally to count life in the Magic The Gathering card game.
Anyway, our hand grinder doesn't have any way to tell what setting it's on, and as we dial in new beans we write on the bag what setting worked well. For a while, we'd just reset to 40 after every grind, but that was annoying and I regularly would lose track of what setting it was on.
I bounce between decaf and caffinated beans a lot, so my grind setting changes regularly. This has been working super well for my wife and I though!
Looks like mine are called Booge but there are a bunch of different styles that might work well for suits. Mine are hollow so you can run a string through, some have keychains, some have elastic loops. Not sure if you plan to keep them in the suit pocket or attach to the hanger or something.