The shell of an egg is porous, meaning that water can pass through it. Over the egg incubation period, water passes from the egg to the air outside. Correct humidity ensures that the right amount of water is lost over time. It is important to remember that humidity will vary, and this is not a big problem; it is the average humidity that matters more.
Humidity is a crucial factor in the success of hatching eggs and the Humidity Pump of the Ova Easy Advance range puts accurate control of humidity in the hands of the user. The Humidity Pump module works in conjunction with the Brinsea Ova Easy Advance 190 and 380 to maintain total control of the incubation humidity level.