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An eudiometer is a laboratory device used to measure the volume of gasses, like when producing gasses in a chemical reaction.
The eudiometer appears like a graduated test tube, but with the graduations upside-down, as it's meant to be hold that way. Eudiometers are made of glass, while plastic eudiometers are not encountered.
Eudiometers can be bought from lab suppliers as well as online.
A simple eudiometer can be made by taking a test tube and draw markings on it.