I have/had a very difficult time trying to read and to line up the fine black scale lines in the Lee scope, especially on the shinny metal where the bullet had the flat filed for the tester ball/point impression. I've read some suggestions that would help like using kids microscope bodies to hold the Lee scope to using head magnifiers which I'm sure help.
However, I tried this simple solution and it made an increditable difference in being able to see the lines. I applied some "whiteout" to that area and used my finger nail to scrap the white out from around the ball indent so the whole dia could be measured.
You can't believe how the fine black lines jump out and show up on that white background.
I would imagine any white substance would work as well, like paint etc.
Just thought I would pass this on as it sure made a difference for me.
I appolize if this is method is old news and has already been suggested by some folks before, Ray