All thermal processes for reducing germs on surfaces or in solutions must be validated initially and then regularly. This is the only way to ensure patient safety, the top priority in the manufacture of pharmaceutical products. In order to enable validation according to EU GMP Guideline Annex 15 Qualification and Validation, the uniform distribution of all important parameters within the sterilizers or autoclaves must be demonstrated. The ideal data loggers for this application are the data loggers of the EBI 12 and EBI 11 family. EBI 12-T22x and EBI 12-T24x Series data loggers combine good measurement accuracy and functionality of a data logger together with the robustness that is required for use in sterilization processes. With the Winlog.validation software it is possible to create templates which can be used to evaluate the validation runs. Documents for IQ and OQ are included in the software package.