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He already has a stereo microscope. That alone makes it pretty easy.

In comparison to a usb scope or a loupe, a stereo microscope is much easier to use, especially since it's what he already has.

If you already have a decent stereo-microscope, then a jeweler's loupe will be of no benefit. At least, that is my opinion. I have a stereo-microscope and have used others' loupes at meet-ups and I...