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Scales were a necessity at the vici markets. They were used to determine the weights of the goods and their respective prices. The steelyard scale with horizontal beams of unequal lengths had the advantage of being quick to use: the goods were hung on the shorter end while a slider mass was pushed along the longer arm.

The square-sectioned beam had four different scales for different weight units. Roman written sources refer to the following:

"trilibra" (3 lbs) 3,360 g
"bilibra" (2 lbs) 2,240 g
"libra" (1 lb) 1,120 g
"semilibra" (0.5 lb) 560 g
"acetabulum" 68.22 g
"unica" (oz) 27.29 g

Bavarian State Conservation Office Landesstelle für die nichtstaatlichen Museen & Bavarian State Archaeological Collection with the support of the Bayerische Sparkassenstiftung