In a niche in the western perimeter wall of the Sanctuary of Apollo there is a copy of the Mensa Ponderaria, the original of which is kept at the National Archaeological Museum of Naples. It is a counter used to check the capacity measures used for goods in trade. Both liquid and solid food, such as cereals, could be measured. These were placed in the appropriate containers and sealed with caps and then emptied after verification.

This counter was already present in pre-Roman times, as indicated by three inscriptions in the Oscan language then deleted when colony was founded (80 BC), and upgraded to the system of Roman weights and measures, as evidenced by the inscription that is still visible.

Date of excavation: 1816-1817