humidity for incubators?

hello all ! we have been given an incubator and have been doing some research,can anyone tell me what the humidity should be? we have read 40% on some sites and 60% on some others could any body claify it for us ? our incubator is a wooden one not sure if it makes a difference.

they are chickens , we have bought a hygrometer and are pretty much ready to go just want to confirm before we start.

we did read about not putting water in at all but 50% would good for a first try we have 10 eggs .

30% - 40% is great for the 1st 18 days then once you spot the 1st egg pip up humidity to 60% i have had fab hatches using this method (thanks Guys  ) I run my incy dry upto about day 14-15 as the room humidity combined with the moisture evaporating from the eggs keeps the humidity spot on at about 35% the last few days though the moisture has been used up so i add an egg cup full of water with cellotape over the top with just a tiny hole left. then once the first egg has pipped i fill the water trays in the incy and sometimes even have to add some cotton wool soaked in warm water to get it up to 60%

hope this of some use to you, im on my 8th hatch this year and all but 1 has been good! 

what eggs have you got to go in?

Debbie

pipping is where the chick is starting to break open it's shell