Radius gauge for when you're modelling items in CAD and you need to check a corner radius or fillet radius. This radius gauge is modeled to exact size and does not take into account any shrinkage. For more accurate print you should print one at 100% first, then make the necessary adjustments in your slicing software to compensate. I've put the 6 and the 9 quite close to each other so that you can easily see which is which.