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No need to go over 100x optical magnification for our needs...you just need to see whats going on at the bevels and edge...the amount of info provided under clear magnification from 30x to 100x is...

A 30x loupe for me too...
I have found it provides enough info...
I prefer to use it in daylight.

I do have one like Geezer mentioned but mine ataches to the cell phone camera by a clamp...60...