Chinese bells measured standard weights and volumes in ancient commerce.

Evidence

To produce perfect tones they had to have absolutely standardized shapes, and the consistency of these shapes meant that the bells could also be used to measure standard volumes. — Neil MacGregor, A History of the World in 100 Objects, 506

Categorization

• corroborated: 2 independent passages support this claim — Neil MacGregor, A History of the World in 100 Objects, 506