Testing the sharpness of a knife after sharpening

[3D Anvil]

I have a USB microscope that's very helpful -- much better than the jeweler's loupe I have.

They exaggerate the magnification, but this is basically what it looks like with a 1-2mm edge bevel:

https://smile.amazon.com/gp/product/B084HJ44J5/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

[Ken S]

3D,

Nice looking USB microscope. Does it happen to have a fine focus control?

Ken

[3D Anvil]

It has fine focus control of sorts.  The black knob on the back adjusts the height (zoom and course focus) while the gray ring on the barrel does finer focus.  It's a bit fiddly in practice, but not bad.