I put 48 eggs in the incubator Monday. 29 Rhode Island Red, 19 Barred Rock from a local source. Much more than I need, but we'll see what hatches. I don't have a good way to measure humidity. I have a Radio Shack transmitter, but it won't fit inside with all the eggs. From my memory of using the TopHatch incubator, I need to fill the water reservoir to get to 50-55%. To get it higher for hatching, I've generally had to add sponges. I may try "candling for humidity" as suggested. Further updates as event warrant.