Constant temperature and humidity chamber is also called high and low temperature and humidity chamber, programmable high and low temperature chamber, can simulate a variety of temperature and humidity environment, mainly for electronic, electrical, household appliances, automobiles and other product parts and materials in the constant wet and heat condition, high temperature, low temperature and alternating wet and heat test, test the performance indicators and adaptability of products. It can also be used for all kinds of textiles and fabrics to adjust temperature and humidity before the test.