I know I’m not the first one to come up with something like this, but I figured I’d share it anyway. When you buy micromesh sanding pads, they are color coded, but come in a pack of 9 (yes, nine) different grits. I used to write a number on each grit, but quickly found that they smudge beyond legibility even when using a sharpie. So I came up with this simple, quick refernce system. As you can see, it’s quite easy to keep them all in order this way.
-- "It's not a mistake. It's a design feature."