I have 5 hygrometers and they all read different. I calibrated all of them with the salt/water for 12 hours, set them to 75% (the digital I just made a note how far they were off), put them in the bator and none of them read the same. I am due for lockdown on saturday and not sure what to do. This is my first attempt at hatching and I don't want to mess it up. Any help would be appreciated.