There is no way to know which is accurate. I've had hygrometers that were way off.
The critical thing is to have a precise thermometer.
I love this extremely accurate Bluetooth combination thermometer/hygrometer.
https://www.amazon.com/Govee-Thermometer-Hygrometer-Bluetooth-Temperature/dp/B07R586J37
Remove the tray.
I've tried everything from ice in the nest to constantly removing them. It is a waste of time.
I grew up with leghorns but with 100 hens, there were always 2-4 hens in broody jail. That is really thee only thing that works.
Whenever I see a coop built with more nests than the chickens it would hold need, I know the builder knows nothing about chickens so I would expect the ventilation to be inadequate and the height to be too short for the roosts to be significantly higher than the nests.
Is there any ventilation...
That's an unusual problem. I would put the chick with the brooder chicks and put the hen in broody jail. That is an elevated wire bottom cage with a little food and water in the cage. There can be no way to plunk her bottom onto a solid surface because you want cool air to get to her underside...
Yes I know Israel is at the top of the list for dealing with the virus and administering vaccines but if I went there, I don't think I would be on a list. Then I'd have to buy that expensive plane ticket and deal with the danger of contracting it on the plane.
Not that I wouldn't want to visit...
Again, it could be a dozen things. You undoubtedly will have lots of similar questions as you continue to incubate so here is a great asset for breakout analysis.
Hope this helps.
https://ufdc.ufl.edu/IR00004437/00001
A calibration weight is always a good idea. I've had success with fairly cheap pocket gram scales. The ones I've used were more accurate than some kitchen scales.
My favorite scale is a MyWeight KD-8000. Extremely accurate and repeatable. It's capacity is 8 kg. With a large platform so I can...
Quarantine is always a good approach.
I have Mediterranean class roosters and have only had a handful of American class roosters but at this time of year, it may not be uncommon for their combs and wattles to pale due to the day length shrinking the gonads.
I thought that ubuy site I sent you the link for was a Thai site. I figured that was why the govee sensor was about twice the price as the one I buy.
At 772 Bhat it is just over $25. When I get it from Amazon it is $15.
That should make it cheaper than importing.
What I love about it is that...
I've never had an egg look like it but if I had to guess, I'd say it is calcium.
I do have hens that apply an added coat of calcium after pigment is applied but it isn't that thick, it just pales the color of the egg.