Unreliable balance at all!

The displayed weight varies depending on how one positions his feet on the scale, it is anything.
When I lean slightly back (weight on heels) it displays 81 kg, if instead I lean slightly forward (weight on toes): it displays 87 kg! it's a sacred difference!
When I stay upright she announces 85 kg me if I down and then back up above just after She tells me randomly 1 kg + or - relative to previous weighing.
In short this balance is to flee if you want a serious track your weight loss.