Browneggfan--- 75% is good humidity.The chicks tend to stick to the shell if its below 60%.
The Lisser -----the tray I bought at
Walmart for a dollar.It has a sponge cut in two and no lid.I put 1/2" wire on top for the fan because of water and electricity not mixing.The fan has been circulation the humidity really good.The brooder lamp has a 60 watt bulb in it.Go no higher on the bulb or you'll get hotter temps,no lower either.
Here is a parts list for everyone:
Walmart
one 10 gallon aquarium 10.00
one fan 6.00
one plastic pencil tray 1.00
one pack of sponges 2.00
Lowes
brooder lamp 9.00
pack of 60 watt bulbs 2.00
1/2" wire mesh 6.00 per roll
12"x20" single pane glass 4.00
one roll black duct tape 3.00
thermometer with humidity gage (manual) 3.65
Most of this stuff I had around the house except the fan.you must make a cage for the tray so your fan can sit on top,then make a tray for the eggs and a barrier so the chicks wont get into the fan when they hatch.Make sure the thermometer is in the middle of the incubator.The temps dont even fluctuate.Its been a toasty 99 degrees with 75% humidity.
I only turn the eggs once a day.Do hens put eggs under them pointy side down??of course not.I do in the incubator because the air sac should be on the fat end,and 2--the egg tray with 1/2" mesh works fine with the pointy side.
Sometimes the temp goes to 102 so I move the light just over the fan,then the temp comes back down to 99.not much adjustments at all.
There will be a gap on the fan side along the rim of the aquarium.Dont worry about it.It helps keep the humidity at 75% or so.if you cover it with duct tape,the humidity will spike at 100% so dont do this.
The water tray must have sponges in it and tape the mesh to the tray with duct tape.
also tape the edges of the top glass with duct tape to avoid cuts.