An exchangeable expendable part of a milking arrangement includes an identification tag with data by which a model or a manufacturing date of the exchangeable expendable part is uniquely identified. The tag is readable by a reader arranged to repeatedly read the tag and to forward the readings to a computer system, whereby the computer system identifies the model and/or a manufacturing date of the part based on the readings； and, in response to the identified model and/or manufacturing date, i) alerts an operator, ii) monitors and/or controls the milking arrangement, and/or iii) makes the model and/or the manufacturing date of the part available to an operator. Exchangeable expendable parts include teat cup liners, cartridges including teat cup liners, and milk or vacuum tubes connected to teat cups.
