It's an electronic scale, but why is there a big difference in weight?

There is a 2.5 kg difference between measuring at home and at my friend's house on the same day.

Both are electronic weights.

The spring scales may change, so you need to zero it well.

Isn't there anything like that?

Why is there a big difference in weight when it's an electronic scale?

1867 2017-08-25 Lady

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