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Urmh... I'm not sure that's big enough.

Awesome! The loupe that Glen linked to is precisely the one that I bought - can't wait to receive it!

I thought I'd add some photographs from the USB microscope in question:

Shot One (Flatters and Garnett, microtome)...

Having tried one of the cheap USB microscopes from ebay recently I can recommend *not* getting one. It would be unfair to say that it doesn't work but the thing is so fiddly and difficult to set up...