I've provided volume measures for the cream, milk, and sugar, but the chocolate is best weighed, especially the chocolate that gets melted into the ice cream base. I can't measure a chocolate bar by volume — it doesn't fit nicely into a measuring cup. You're going to want to use a kitchen scale for that. I did provide ounce measurements for the chocolate, so if consider using a Baker's chocolate bar, those come with markings on each square to show how much it weighs.