I agree with Featherfoot, I think humidity needs are a little different for everybody. (Differences in location and humidity in the area outside of the incubator)
Our first hatch of chicks we didn't even measure the humidity. We were so newbies we just stuck in 42 eggs, and had 28 hatch. That was plenty for us, and I was happy. Lately we've only been hatching guineas, and I have been keeping the humidity high during the first 24 days, 70%+, and raising it to 100%+ during hatch. We've been getting around 50% hatch, with at least 35% (I'm guessing) developed keets but not hatched. With this batch (22 guinea and 6 chicken) I'm trying to keep the humidity 50-60% during the first 18 days. I plan to raise the humidity to..at least 75% I guess when the chicks are supposed to hatch. (The chicks are going to pip about 4 days before the guineas) I believe I've been accidentally 'drowning' some of my keets. I hope to get a better hatch rate this time. If I don't, I'm going to try keeping the humidity even lower. We'll see what works.
Our first hatch of chicks we didn't even measure the humidity. We were so newbies we just stuck in 42 eggs, and had 28 hatch. That was plenty for us, and I was happy. Lately we've only been hatching guineas, and I have been keeping the humidity high during the first 24 days, 70%+, and raising it to 100%+ during hatch. We've been getting around 50% hatch, with at least 35% (I'm guessing) developed keets but not hatched. With this batch (22 guinea and 6 chicken) I'm trying to keep the humidity 50-60% during the first 18 days. I plan to raise the humidity to..at least 75% I guess when the chicks are supposed to hatch. (The chicks are going to pip about 4 days before the guineas) I believe I've been accidentally 'drowning' some of my keets. I hope to get a better hatch rate this time. If I don't, I'm going to try keeping the humidity even lower. We'll see what works.