feature:☆ The environmental humidity liquid crystal display function ? ? ? ??☆ Accurately control the humidity of 1% ? ? ??☆ Automatic defrosting function ? ? ?☆ Sensor fault indication function◆Use occasion ? ? ? ? ??Production workshop, leather,grain and oil products, product power equipment, cultural and educational books, printing products, audio and video products, communication equipment and material warehouse, tobacco products,underground engineering, drug storage,