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Question/Answer

Is the 42mm dimension i.d. or o.d.?

That measurement is the outer diameter.

Is there a way to ID these tubes so the markings will withstand the digestion process?

A permanent marker such as Sharpie brand can be used on the glass above where it sits in the block. Barring any spills or boil-over, that marking should remain on the glass during the digestion procedure.

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