How well can you see a cutting of a bit. I have a stereo microscope so I have no problem. But before that I used one of these:
About midway down the page is the Fowler pocket scope. Mine is the 20 power. It works extremely well if you have good light source. It is also graduated (maybe I should say mine is). It was helpfull in reallying seeing what was going on with an engraving chisel.
You do need good light to see under while using it. If I didn't have the scope I'd be using the pocket scope once again.