"Custody" jako szczególny rodzaj pomiaru, zgodnie z poniższą klasyfikacją:
The metering systems can be used for varying purposes, distinguishing between fiscal metering (where taxes are to be paid on the amount of oil transported), custody transfer metering (where the oil changes owners) and - especially with pipelines - allocation metering (where product flows from different origins and is joined in one pipeline, or where multiple consumers are supplied through one line).
I jeszcze:
In the metering business the terms ‘fiscal’ and ‘custody’ are essentially interchangeable, although fiscal means ‘concerned with government finance and policy’ and custody means ‘safekeeping or guardianship’. Neither term defines a level of metering accuracy in itself, although both are taken to mean the best accuracy in normal oil field practice.