humidity inside incubator

[badmagic2006]

I am planning on converting an old fridge into an incubator. What does the humidity need to be inside the fridge? Or do I just need to be concerned with the humidity inside the egg box? If the humidity needs to be high inside the fridge then what is a good range?

[Stewart_Reptiles]

You need to be concerned about the humidity inside the egg box and it should be as close to 100% as possible.