Optical, weighing, measuring, signaling and checking apparatus and instruments; apparatus and instruments for conducting, switching, transforming, accumulating, regulating and controlling electricity; data processing equipment and computers; electric and electronical measuring apparatus, in particular, electric and electronical measuring apparatus in the field of industrial process measuring technology; flow meters for measuring the flow of solids and bulk materials, in particular, microwave flow meters; computer software for operation electric and electronic measuring apparatus, in particular, computer software for operating and driving electric and electronical measuring apparatus