Measuring instruments used for wine and oil, and a zomalystera, and a mustard strainer, and a wine strainer, have an exterior and an interior; [these are] the words of R’ Meir. R’ Yehudah says: They do not have [an exterior and an interior]. R’ Shimon says: They do have [an exterior and an interior], [in that if] they were rendered tamei through their exterior, their contents [remain] tahor, but one must immerse [the entire utensil].

[Regarding] a rova and a half-rova, [if] the rova becomes tamei, the half-rova does not become tamei. [If] the half-rova becomes tamei, the rova does not become tamei. They said before R’ Akiva: Given that the half- rova is the exterior of the rova, a utensil whose interior became tamei, does not its exterior become tamei? He said to them: [This question] is that of the group [of students who sit] in front, or perhaps the rova is [considered] the exterior of the half-rova! [Thus,] a utensil whose exterior becomes tamei, its interior does not become tamei.

[If] the rova becomes tamei, the rova and its exterior are tamei, [but] the half-rova and its exterior are tahor. [If] the half-rova becomes tamei, the half-rova and its exterior are tamei, [but] the rova and its exterior are tahor. [If] the exterior of the rova becomes tamei, the exterior of the half-rova is tahor; [these are the] words of R’ Meir. But the Sages say: We do not divide exteriors. And when one immerses [this utensil], he must immerse it in its entirety.

[Regarding] the bases of utensils, and their rims, and their ears, and handles of utensils that can receive, upon which liquids fell, one dries them and they are tahor. But [regarding] all other utensils (that cannot hold pomegranates) which do not have an exterior and an interior, upon a part of which liquids fell, all of it is tamei. [Regarding] a utensil whose exterior was rendered tamei by liquids, its exterior is tamei, [but] its interior, its rim, its ears, and its handles are tahor. [If] its interior became tamei, all of it is tamei.