Precision Ceramic Cylinder

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I understand this is a bit "off topic" but has anyone ever seen, or know of a source for, a ceramic cylinder used for calibrating machine tools?

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One source I found:
https://www.microplan-group.com/en/prod ... ts-ac.html

Does it have to be ceramic?

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Thanks Norbert. I found the same website. We're looking for a local supplier here in the US but would consider going outside US if only option. Due to the size, ceramic is a much lighter and easier to handle option. Obviously, more stable from a temperature point of view.

[[Ow...]]

I've seen them used to tram in lathe axis but, would work for anything I suppose.
In my experience, a ceramic square is generally used on milling type of machinery but, I could see using both too.

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It would be used primarily for setting up Fanuc Robo-Drills and other milling machines before we ship them to customers.

[[Ow...]]

Taking the cost of ceramic and the damage that would incur if it was dropped into account, I'd be inclined to looking at some the newer laser methods.
https://www.youtube.com/watch?v=odBi0cmIBYA

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We do use laser on some applications but they're only using this gage to check the tram of the machines.