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.
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ounces
Kilograms * * * * * No you would not! A kilogram is a measure of mass. Weight is measured in Newtons!
pounds
Undoubtedly a truck scale.
A postage scale or food scale is. After the weight has been determined, it can best be expressed in ounces or Newtons, and its mass in grams.