I place 4 digital temperature/hygrometers. When I first began incubating Seramas, I was checking that thing several times a day and night in hopes that I would always have everything right. They aren’t the easiest to artificially incubate. I researched everything I could find, did everything right, and I was still practically parked by that incubator 24/7 watching temperature and humidity readings! Since then, I’ve primarily let my broodies take that pressure off of me.Your smart to not trust the temps and humidity on the incubators devices! I use at least one back up for both. My next to the last hatch would of been better except I slipped up and trusted a new device and did not check it for several days with a back up. The temps were off a full degree and the humidity several degrees!