Constant temperature and humidity chamber that precisely controls temperature and humidity simultaneously to maintain constant environmental conditions. Environmental testing equipment used for durability testing, quality inspection, and reliability evaluation of electronic components, resin materials, and metal parts. Capable of conducting tests compliant with JIS, IEC, and ASTM standards, used in quality control and R&D departments of manufacturing industries for temperature-humidity cycle testing, accelerated aging tests, and storage stability testing of products. Program control function enables reproduction of complex environmental patterns. Unlike thermal shock testers and salt spray testers, this equipment specializes in simultaneous temperature and humidity control.