50% is too high. We're aiming for the air cells to grow and grow fast to catch up to where they need to be. The humidity in the incubator needs to be as low as possible until the air cells catch up. No water in the incubator.
The air cells should look like this chart:
50% at what temperature? I'm asking because, you see, 50% at 50 F for example would yield less than 10% humidity when warmed to 100 F according to this following chart.
Apologies, but I'm confused about what you're trying to say here. That chart seems to be describing dew points, not what percent the humidity is at certain temperatures.
With a hygrometer, it is sensing the percent of humidity in the air. Whatever percent it says it is, that's what percent the humidity is at the current temperature in the incubator.
I'm assuming the OP has the hygrometer in their incubator. The humidity outside the incubator has no bearing on the eggs. So having the hygrometer outside the incubator would be useless and having it inside says what the humidity currently is, so there's no need to try to do any calculations to tell what it is.
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But perhaps OP was going off of predicted outside humidity on a weather report? We'll have to wait for them to confirm.
