Are they water rated? Looks like something you could take out in the field. Can just picture it now, Paolo sanding branch stubs on street trees to take pictures "in the field".I got this little toy for my kids for ~$40:
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It works so I tried on an endgrain sample I had. These are literally the first pictures I took:
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Highly recommended!!
Search for "adventure microscope" and you'll find it, I got it from amazon.it