New weather instrument - the cyanometer?

This is kind of weather related…

I came across a description of a cyanometer today - Cyanometer - Wikipedia

I’d never heard of these before and they sound interesting. I’ve never seen one for sale, but I guess one could be made with an accurate colour printer.

I wonder if anyone here has ever seen/used one? I’m also wondering whether there’s a modern equivalent, perhaps using a webcam?

Every Bluesky user should have one :wink:

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