The purpose of the temperature and humidity chamber is to simulate the combination of high and low temperature and humidity in the climate environment (high and low temperature operation and storage, temperature cycle, high temperature and humidity, low temperature and low humidity, condensation test… etc.), to detect whether the adaptability and characteristics of the product itself have changed. To comply with international specifications (IEC, JIS, GB, MIL…) in order to achieve international measurement program consistency (including test steps, conditions, methods) to avoid cognitive differences, and reduce the range of uncertainties in measurement occurred.