The conditioned chambers of the CLIMACELL product line provide all conditions for exact and reproducible simulation of various climatic conditions, applicable e.g. in testing of stability components and food or chemicals packages, or in studies of germs, plant or tissue cultures, and insects. These devices offer an interesting alternative to expensive testing chambers and testing rooms. Microprocessor-controlled system of humidification and dehumidification with a powerful lighting system guarantees excellent homogenous parameters for testing and growth conditions.