Rigid measures of liquid volume, made of metal, must meet standards of?

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Rigid metal liquid-volume measures must keep their stated capacity under typical use, handling, and temperature changes. The wall needs to be thick enough to resist bending, denting, or permanent deformation that would alter the internal volume, so a minimum thickness is specified to ensure dimensional stability and accuracy. Hardness tests (how resistant the material is to indentation) relate to wear resistance, not to maintaining a precise volume, so they aren’t the standard for this requirement. Making the walls thicker than the minimum wouldn’t improve accuracy and would add unnecessary weight and cost, so a maximum thickness isn’t required.