The RTTR cable monitoring system consists of a temperature measurement device, the Distributed Temperature Sensing (DTS), and our visualization and RTTR calculation software, a current interface for reading in the current data, an optical fiber for temperature measurement and. The RTTR cable monitoring system consists of a temperature measurement device, the Distributed Temperature Sensing (DTS), and our visualization and RTTR calculation software, a current interface for reading in the current data, an optical fiber for temperature measurement and. The RTTR cable monitoring system consists of a temperature measurement device, the Distributed Temperature Sensing (DTS), and our visualization and RTTR calculation software, a current interface for reading in the current data, an optical fiber for temperature measurement and network interfaces for. The products and services, developed by GESO, are based on the distributed fiber optic temperature sensing technique (D istributed T emperature S ensing=DTS). This technique enables the acquisition of temperature data along a temperature sensitive cable (Fiber optical cable) with a high resolution. Temperature is an interesting tracer that is used for many different hydrological and hydraulic measurements. Temperatures are recorded along the optical sensor cable, thus not at points, but as a continuous profile. A high accuracy of temperature.