I'm asking for a recommendation for a quality microscope.

How about a B & L jewellers loop. I used one to determine obliterated firearm serial numbers, they come in various magnification powers, sizes and optical quality.

Watchmaker's Loupes

Watchmaker's Loupes are lightweight, glass magnifiers that are available in a complete range of powers

The OP wants a USB microscope.

Correct @jasonbourne71  thanks 

I've seen in the past some people using a USB scope. We do have loops but our eyes are not like they used to be. 

I thought someone in this forum had used a quality scope they could recommend.

Dino-Lite USB Digital Microscope like the AM3113

Wallyscope probably the best