(c)GMP Regulations worldwide, like for example „USP Chapter 1079 Good Storage and Distribution Practices for Drug Products“ oder „EC Guidelines on Good Distribution Practice of Medicinal Products for Human Use“ demand the uniformity of the temperature and relative humidity across the storage facilities of pharmaceutical suppliers and manufacturers. It is recommended that monitors are located in areas that are most likely to show fluctuations. To identify these worst case areas or areas that could endanger the quality of the stored products, a mapping procedure of the storage area is mandatory. The ideal data loggers for this application are the data loggers of the EBI 25 and EBI 20 family. Especially the EBI 25-T Temperature Data Loggers with Radio Technology combine good measurement accuracy and functionality of a data logger together with the possibility to monitor up to 48 loggers via one interface. With the Winlog.web software it is possible to visualize all measured values live on one screen. On top the alarming function guarantees fast responses in case of temperature or humidity deviations. Documents for IQ and OQ can be obtained as well.