Standardized measurement for trade between world with different gravity?

So I was building my world with underwater civilizations and someone raised a question (see here) that I thought was interesting related to trade aspect: how would we have a standardized measurement when things weight differently?

In the case of the world I'm building, since there are kingdoms underwater and the aquatic races do trade with humans, how would they have a measurement so that there would be no misunderstanding about how much goods is in the contract?

Furthermore, this also applies to interplanetary trading (which doesn't really concern my story, but I'm curious about nonetheless). How would we have a measurement when we're trading between planets with different gravity?

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Standardized measurement for trade between world with different gravity?

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