This constant temperature and humidity instrument is developed and manufactured by Shenzhen Hongruida Technology Co., Ltd. It adopts an advanced and reliable refrigeration system, an imported LCD liquid crystal display with Chinese and English touch screen controller, a large electric heating observation window, a reliable and excellent uniform air supply system, a stable and reliable water circulation supply system, and professional software. It realizes the control of multiple testing machines with one computer. The high-quality components and optimized design scheme used make the machine operate with low noise, making it an advanced machine that can maintain the product without deformation or discoloration. Its introduction not only ensures the quality of the product, but also further promotes the development of Maidian in the field of labeling, laying a solid foundation for it.