interface (hardware and/or software) which only allows the introduction of such data into the data processing device of an instrument, module or electronic component, which cannot: - display data which are not clearly defined and which could be taken for a weighing result; - falsify displayed, processed or stored weighing results or primary indications; or - adjust the instrument or change any adjustment factor, except releasing an adjustment procedure with incorporated devices or, in the case of class I instruments with external adjustment weights as well