Marcus Link  Marcus.Link@ptb.de  +49-531-592-1146 Head of Working Group ; Software testing according WELMEC 2.3 Certificates for modules and peripherals of NAWIs and AWIs; POS, data storage (WELMEC 2.5). Werner Baars  Werner.Baars@ptb.de  +49-531-592-1145 Software testing according WELMEC 2.3 Certificates for modules and peripherals of NAWIs and AWIs; POS, data storage (WELMEC 2.5). Michael Denzel  Michael.Denzel@ptb.de  +49-531-592-1147 Software testing according WELMEC 2.3 Certificates for modules and peripherals of NAWIs and AWIs; POS, data storage (WELMEC 2.5).