The HygroLog NT humidity and temperature datalogger from Rotronic meets the compliance requirements of regulations such as FDA CFR21 Part 11 and GAMP4. Depending on the version and options, up to seven combined humidity and temperature probes can be connected. The HW4 software package further enhances system performance and capability. Compliance with regulatory requirements was a key consideration during development, and this is acheived by the provision of tools such as digital signatures, audit trails, encoding and protocol generation. With the HygroLog measurement data is stored on removable compact flash cards. The standard 16 Mb card allows up to 752,000 measurement points to be stored. A range of communications options such Bluetooth wireless, USB and serial interfaces give the user great flexibility.