Professional classification of laboratory constant temperature and humidity chambers for precise simultaneous control of temperature and humidity. Equipment for conducting temperature and humidity environmental testing of products and components in material testing, quality inspection, and reliability testing. Used in quality control departments of manufacturing industries for high-temperature high-humidity testing of electronic components, environmental degradation testing of resin materials, and corrosion testing of metal parts. Features program control functions and data logger capabilities, enabling test condition settings compliant with JIS and IEC standards. Distinguished from simple constant temperature chambers or dryers by incorporating humidity control functionality. Available from desktop models to large chamber types, selectable according to test sample size.