These chambers are available in both the climatic (humidity and temperature control) and the thermostatic version (temperature control only). The basic difference between Hygros and Challenge chambers is the user interface: PC with WinKratos SW installed + color LCD for Hygros chambers, keyboard + colour display for Challenge chambers. All chambers are manufactured accordigly to the Total Quality procedures, in compliance with the ISO9001 standard. FEATURES: Use of ecological refrigerants such as R404a, R134a, R23. Humidification system feeded by net water. Double 'dry steam' generator to prevent condensation onto specimens. µPLC-based control and management system with RS232/RS422 or RS485 serial outputs. De-humidification system operating down to -20° C dew point. Heated inspection hole: a fully-transparent heating film allows a clear vision of the test compartment from the outside and prevents condensation from forming onto the glass. Network connection of several chambers to a single "master" control unit allowing centralised supervision both in local and remote mode.