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Is a phone camera's macro mode not good enough for occasional use? It's kind of wild that my phone has telephoto and macro with more resolving power than my eyes on both ends (and I have normal vision).

Sounds useful! In a pinch many cell phones have a macro capability that can substitute for a magnifying lens– something to keep in mind when you don't have a magnifier.

I got a pair of magnifying glasses with an LED - the kind that dermatologists use. It's great for taking splinters out of little kid fingers.