These Cabinets are double walled in construction and both the interiors and the exteriors are made of stainless steel sheets. An insulated door with leakproof gasket having a viewing window is provided allowing the user to view the interiors without disturbing the test conditions. The lower portion of the Chamber houses the boiler with an immersion heater fixed with a water level controller for creating humidity. The temperature ranges from 5ºC above ambient to 60ºC, controlled and displayed with a Microprocessor based PID Controller having an accuracy of ±0.5ºC. Relative humidity ranges from 65% to 95% with ±3% accuracy or better. All controls are housed in a panel on the top of the Chamber. Operates on 220/230 Volts AC supply.