I'm sure there's some sort of gadget that can do this but has anyone any idea what it's called?

I'm guessing it's a high precision scanner/camera that can focus on a close area of an item, scan it and analyze the colour(s) it sees there, far more accurately than simply eyeballing the thing.

The reason I'm asking is, first of all, I'm interested, second, I've Googled every variation on a suitable name to no avail, third, if possible, I'd like to get my hands on one, although it's most likely very expensive and therefore out of my reach.

Coppula eam se non posit acceptera jocularum.

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