After sharpening a regular edge there are many easy and fairly accurate ways to test its sharpness level: paper, sponges, hair, or actual food like thinly slicing tomatoes, etc. Different levels of paper thickness tell you a lot: thicker stock like white printer paper usually being easier to cut vs newspaper or phonebook paper for example. Newspaper *in my area* happens to have a significant “grain” direction; its far easier to slice vertically with a 300-600 grit finish, whereas a sideways slice requires a more refined 800-1000+ grit edge to cut cleanly. Straight push cutting requires further refinement, same with slicing a tomato across without holding it in place, shaving arm hair with various levels of ease/smoothness, cutting free-dangling hair etc. All of these variables clearly show the sharpener a wide range/spectrum of sharpness level achieved. I need something like this with serrated knives. Aside from food (like fresh Italian bread with tough crust and soft interior, etc), what type of common items are a good method of testing a serrated edge? I’ve been using thicker paper, sometimes folded once or multiple times, cardboard, etc, but it seems really hard to tell for me, I really can’t judge a serrated edge well at all wth these methods. Any recommendations (aside from buying a bunch of test food)?