The In-VitroCell ES (Energy Saver) NU-5820 Direct Heat CO2 Incubator has a relative humidity (RH) control which ensures that a certain level of humidity is maintained. Vapor is ejected into the chamber to minimize variation in the humidity of the incubator. This incubator boasts a 145°C high heat sterilization as well as 95°C humidified decontamination cycles which serve as measures to prevent and remove contamination of the cells stored in the growth chamber.