Enjoyed your post, thank you for contributing this kind of content.
I wonder, why can't you just pin down a strand of DNA and use an electron microscope (or some other very powerful microscope) to measure its size and directly look at it?
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You certainly can do that, but electron microscopes are very expensive and it takes a lot of effort to prepare DNA for viewing under one. The protocols I wrote about are fairly low cost, rapid, and are commonly done before extensive analysis like with an EM.