Tosefta על תרומות 4:6

Rabbi Yehudah says, a person [is permitted to] measure his untithed produce, and bring it into his house, provided he does not [separate] terumah [according to] measure or weight (see Y. Ter. I.4.5). A person [is permitted to] count his untithed produce and bring it into his house, provided he does not [separate] terumah [according to] quantity.