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Pretty common. You can probably find one in your gutters or roof.

This video says 1 per square meter per year. https://www.youtube.com/watch?v=0xD7SvtPAMM

That's really cool. I also didn't realize scanning electron microscopes were that compact.

He has a companion video about that - apparently that particular SEM is the smallest in the world, and the manufacturer loaned him one to make videos about. But he had a ton of issues with it due to being at a high altitude.

https://www.youtube.com/watch?v=t60I0Z7qCsU

It looks like an amazing channel!

For the curious, the machine in question: https://mymochii.com/

It doesn't appear to be on sale yet. And from the comments on that video, SEM does not appear to be a "toss the sample in the machine and go" process.

How could high altitude negatively affect the machine? The machine uses a vacuum pump. High altitude should help the vacuum pump work faster and better.

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