In response to various comments (and for non Anglophile) ...
A balance shift modifying components, it must be reset.
To completely reset the balance, remove the batteries for one minute (minimum).
Then return the balance and ask where you are going to use it.
Consider asking the to press the small button on the front below to change the display in kilos (by default it comes to books) ...
Then do a reset: Press to turn the scales (do not stay on it), wait until the zeros appear and turn off.
There you can get on and you weigh.
Normally it is accurate.
The simple act of climbing on the starts.
In blue, it's the weight of the moment.
As soon as you get off, just after a few moments, in green, the last recorded weight (which is reset when a reset) ...
Simple, cheap, effective, what more?
Good weighing.
Jp.