It depends on the scale. For a scale in a chemistry lab probably a gram. For old fashioned stores: a kilogram. Precision scales could be a milligram.
There is no real "basic" metric unit for a balance scale. The counterweights you use are determined by the item you are measuring.
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The basic metric unit for weight is the newton.
The basic metric unit of measure for length is the meter (m).
Mass.
The basic unit of length in the metric system is the meter.
Probably a kilogram.