The scales in the old mechanics, with large display digits, as arranged on a large graduated circle set in motion by the weight of the person and of which only the relevant figures apapraissent in the playback window. High stability of the starting setting (wheel) which regularly returns to the set value (0kg or -0,5kg etc. if we want to involve a defect into account the weight of non-clothing left - even introducing an ' psychological bonus' encouragement, like everyone knows that is desired). A net stabilization and insensitive to variations in position of the weighing value is reached, unlike electronic weighing scales where the lower position differential causes variations weighing measurement.
