The intelligent Ethernet data logger for temperature measurement MSX-ilog-RTD/MSX-ilog-TC has 8 or 16 differential inputs for thermocouples or resistance temperature detectors (RTD, Pt100/Pt1000). The parametering and visualisation of the measured values are carried out via an integrated web site. Thus no additional software installation is needed. The acquisition, visualisation and data storage take place automatically. The system was developped for long-term temperature measurement in the harsh industrial environment and thus has a 4 GB build-in flash memory. It has the degree of protection IP 65, numerous protective circuits and an operating temperature from -40°C to +85°C, thus it is also suitable for use outside.