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You would use kilograms (kg) to measure someone's mass in metric units.
Mass can be measured in -- kilogram, and any of its multiples and sub-multiples -- pound-mass -- slug
You would use a balance or a scale to measure matter. These tools can provide the mass or weight of an object by comparing it to standard units of measurement.
Mass is typically measured in kilograms (kg) or grams (g). The tool used to measure mass is called a balance or a scale.
The is only one Metric System. That is the one you would use. The units you use to measure mass is the kilogram (Kg).