Could you post a link to the microscope you are speaking of?
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i use a dino-lite 211 for measuring sra. it does the job nicely. what you do need is a very stable support for the scope, like a decent tripod and a macro focusing rail. i posted a discussion on another forum about this. i was coached by wally malewicz and michael fremer on how to measure sra using the scope. they were vary helpful.
In my view, all USB microcopes at the hobby level (means cheap) are close to useless.
I have designed a built a DIY stylus microscope patterened after the virtually unavailable Shure SEK-2. This DIY project is written up and posted on the Audio Karma forum. Here is the link:
If you want a microscope that really works you should check it out.