Using Colored Stitch Markers as Hook Size Indicators

I have over 200 plastic stitch markers from China (cheaper that way and they seldom snag the yarn). Someone showed me to mark a few of them with hook sizes (G, H, I, J). Some ladies put the metric size (4.00, 4.5, 5.00, 5.5). This helps to remember what size hook you are using with a project when you have multiple projects going at once.