Do not weigh less than 0.5 grams ...

It would begin again, I would choose another model.
It's fine if you have nothing to weigh under 0.5 gr but it detects that from 0.5 or 0,6gr.
Beyond these values, it works well.
I did not understand the utility of two protective cover, because if you does not remove the two, it does not weigh properly.