>>64139332
I just used it 20 minutes ago to before and after my chef knife, it was 378 avg on first three tests before sharpening, after sharpening it avged 211, which is actually slightly sharper than i got testing a fresh Dewalt Carbide utility blade (218). It does give you a quantifiable result for sharpening or making knives. It will not tell you things like whether your edge is toothy or not, or how good your cutting geometry is, though. The only thing it can really tell you is how thin the apex is. But that's good enough for me, I know what angles im sharpening at and what grits leave a toothy edge and not.

There's three you can get and the price varies a lot. Picrel testers are $240/$170/$125 respectively. I got the most expensive one because I felt like it.