A multi-step reduction gear with forward reverse gears comprising a drive shaft, a power take-off shaft, three planet sets, rotating shafts as well as six switch elements. In order to load the lifting motors evenly and avoid torsions in the lifter, a balancing circuit that measures the supply currents of the lifting motors is provided. This error may be isolated from the high-resolution image to create an error image which may be modified with a visual model to remove invisible errors thereby creating a visible error image. A power source is coupled to the weight measuring member and the display. A second inverting amplifier is configured to generate a fourth intermediate signal using the third intermediate signal. Also, the capacitor pair structure could further increase its entire capacitance through vias connecting the same capacitor pair structures on different metal layers.