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Use what works for you. You do not need to see SEM quality every time, for every process.

I use loups from 20-60X, hand held scopes from 60 -100 and USB up to 400x, depending on what level of...

Any magnification is better than none. I like a 60X lighted loupe, that can be purchased for as low as $2. Ironically they are cheaper than buying replacement batteries, so buy a few.

You can buy...