While kilogram is a measure of mass and newton is a measure of force, on earth, in many non-scientific settings we default to swapping around some units to have the same intent. Kilograms is mass, so while the scale is detecting force it displays them in terms of the force (weight) of a body (on earth) of this many kilograms.
If you have to travel to another planet or moon or something you could probably ask the scale company to make one appropriate for that location.
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