Water samples must be traceable in order to produce reliable, recognized results in the later analysis. This traceability can be guaranteed by consistently logging and documenting each link in the sampling chain, which is where RFID (Radio Frequency Identification) comes into play. RFID is a key technology used to facilitate the identification of system modules. Each sample is assigned to its unique RFID identifier and the relevant data at the time it is taken and later on transferred to the photometer. The entire process is fully documented, which means it is permanently traceable.