Humidity is the amount of water vapor in the air, which can influence the behavior and properties of a product. Humidity can affect the moisture content, weight, dimension, electrical conductivity, and biological activity of a product. Humidity environmental test chambers are systems that control the temperature and relative humidity inside a chamber to simulate different climatic conditions for testing a product. They can create various humidity levels from 10% to 95%, depending on the product specifications and testing standards56. Humidity environmental test chambers are used for testing products such as pharmaceuticals, cosmetics, electronics, textiles, and food.