As I look in my bator right now, at one of those exact same springfields. I would not trust it, trust the mercury one. My springfield is 1 to 3 high on temp and up to 25 high on humidity. Right now, my bator is 41 perecnt and 99.5 forced air with certified instrument, but the springfield has it at 102.3 and 59 percent. I am surprised i got any thing to hatch last time, but did have some hatch. From my eggtopsies I decided to take my stuff to my lab at work and verify against a standard. and boy was that thing so wrong. I will be putting a mercury in next time I open, just to confirm my other digiatl, but it was close enough on calibration to work. Last time I used the sprinfield, and tried to keep em dry, but when I threw out some clears, and some had evaporated to anout 1/5 the egg, I was wooried that I had killed them all. Was just a bad set of eggs. the fertil eggs deveopled fine, but i hathed about a day early and about 50 percent were fully formed and never pipped. I think I was jsut to dry all the time. I will keep thsi set at 40 to 44 day ! to 18 and try to 50 to 60 at lock down. My temps have been right on from 99.3 to 99.7 so far.5 days and counting