Probably a kilogram.
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The unit used on spring scales is 'Newtons.'
A scale
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.
Spring scales can measure grams, newtons, or pounds.
Ounces or Grams