That depends what aspect of a marble you want to measure, for example its diameter, its mass, its density, its color, etc.
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Mass is measured in kilograms. Weight is measured in newtons. If you are asking which unit to choose to measure then mass of a marble, then you need to use the submultiple of the kilogram, the gram.
Which unit would you use to measure the water in a full tub?
I would use kilometers.
the unit is pop. = Piece Of Paper
In the US, I would use yards.