I truly have no idea... my humidity tends be high too..
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Ole el cheapo ones work perfectly as long as you calibrate them first.For those who do measure humidity, I found a couple good quality ones for very little money.
https://www.cigarsinternational.com/p/zederkoff-hygrometer-square-hygrometers/1488080/
https://www.cigarsinternational.com/p/western-caliber-iv-hygrometer-hygrometers/1494993/#p-179360
Since I currently only hatch one species, breed and line, all laid at the same elevation, I see very little difference in egg porosity. Some day I probably will invest in some good hygrometers.
I had 2 el cheapos I calibrated and within 3 days they were off by 40%.Ole el cheapo ones work perfectly as long as you calibrate them first.
Don't think hens have gram scales eitherPersonally, I don't even check humidity in the incubator. The way I look at it, a hen can't control ambient humidity. If it is an arid environment or a rainstorm is brewing, the hen can't change that but they still hatch eggs.
Regardless of the species, an egg is supposed to lose about 13% weight (give or take a couple % points) throughout incubation.
Currently, I don't even own a hygrometer. I have a couple gram scales and use those to track weight loss.