The centerpiece of the inline process monitoring is the UV-VIS spectrophotometer "InSpectro X", this covers the wavelength range from 220 to 820 nm and this with a resolution of 1 nm over the entire spectrum. "InSpectro X" is designed with all its components to be robust enough to produce accurate and continuous measurements in the industrial production environment. The stainless steel housing is IP66 rated for protection against splashing water and dust. An integrated, powerful thermo-electric heating and cooling unit ensures constant temperature conditions inside the housing and thus for the optical components. It has two optical interfaces for the connection of two measuring probes for the simultaneous monitoring of two processes with one system. All COLVISTEC optical fiber probes (CP, RPMP, TPMP and others) can be connected to the "InSpectro X". The complete system is completed with a comprehensive software designed for process monitoring. This is easy to operate and easy to integrate into the process control, e.g. via software interface (OPC UA) or analog as current/voltage signals. Other software packages such as the residence time analysis (ReTA) software are also available. With ReTA it is easy to perform residence time measurements elegantly and to analyze them directly after the measurement. All this without taking samples and the associated time-consuming analytical work in the laboratory. All residence time relevant data (numerical as well as graphical) are available with one mouse click directly after the measurement, e.g. mean residence time, Bodenstein number, distribution of tracer amount over time, etc.