Reading about humidity levels. Everything I read including on here is different. Some say 50. Some say 85-87. Some say 60-65.
What is it????

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x2I'll take a stab at this ----
The 50 & 85-87 are basically the sane thing, BUT, 50 is percentage of humidity & 85-87 is a wet bulb reading , which is approximately 50% humidity
So normally you would run your incubator at 50% humidity on a humidity gage OR 85-87 degrees if your using a wet bulb.
It's normally recommended that you raise your humidity the last 3 days of incubation too provide more humidity to help the chicks hatch. those settings are 68 to 80 % humidity on a humidity gage or 90-94 if you are using a wet bulb which is equal to 68-80% humidity
There are a LOT of differing opinions on how much humidity you need both during incubation & the last 3 days. I've always used 99.5 - 100 during incubation & 90 (wet bulb reading) the last three days. The thing is, you have to have very accurate thermometers & an incubator that will maintain very accurate temperatures to make this work. Higher/lower heat or higher/lower humidity causes a lot of problems