Precision data logger for connecting external sensors for temperature, humidity & analogue inputs. The optional Y connector can connect up to four external temperature/humidity sensors. A further two analogue inputs are provided. In combination with the Opus 20E's LAN capability, this can be used to implement universal, real-time monitoring networks for climate monitoring in production areas, climate chambers & incubators, for example. Analysis software Smart Graph 3 with automatic measurement device management is included.