In place of "weigh"? "scale" is possible in that context but is very unusual. People will think you are an ant climbing over the apples.

The English noun "scale" = "scara" in Romanian. Can "scara" be a verb? (Please forgive my lack of diacritics.)

It's technically correct but sounds awkward. In practice one is more likely to say 'would you weigh these apples please?'

"Vă rog" strongly suggests that the following "cântăriți" is an imperative. Context matters.