Scanning errors and document feed errors are prevented by pressing originals, including thin originals and thick originals of greatly different thicknesses, to the scanning surface of an image sensor with pressure appropriate for the respective original. The inner surface of the measuring device is provided with an electrically conductive inner structure, which functions as an electrode for a contact with the skin of the hand to which the device is attached. The control domains may be dynamically selected and assigned to schedulers in a manner that achieves a high throughput gain. Finally, the wholesaler calculates a variable price for the products, based on provided variable margin amount and transmits the calculated variable price for the products to the distributor.