Assuming you stay on the same planet, weight and mass are directly proportional. (Almost) anywhere on Earth, 1 kg is 9.8 N. So essentially the scale is measuring force in Newtons, but just displaying that weight in kilograms (or more accurately, “kilogram-forces”).
If you took your scale to the moon and tried to weigh yourself there, it would be wrong because it’s not calibrated to make that conversion.
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