In a fuel cell unit 16 that constitutes a fuel cell module 2 of an SOFC device 1, a collector cap 86a is connected to an inner electrode layer 90 via a seal material 96 as an Ag seal portion. Each wireless electrode includes a barcode thereon configured to allow a user to associate a set of wireless electrodes with a particular display. The invention further provides an industrial process for obtaining tomato pulp and tomato concentrate from tomato juice.