maintaining humidity

[need help]

I am new to this and I know humidty is kept with a wet sponge or towel, but how do I maintain a constant humidity or even increase it during lock down? I have a still air incubator with only 11 eggs. But I am trying to give them the best shot. I have little room for a hygrometer so I am wondering how to check humidity accurately. Any ideas?

 

[SierraView]

There is no way to accurately know your humidity without a hygrometer. I know some people that live in humid climates don't add any water till last 3 days. Then add water for lock down.

I haven't used a still air incubator before. Does it have a tray in the bottom to fill with water?

 

[DirtCreature]

what kind of incubator do you use?

Does it have an egg turner in it? or are you doing it by hand?