I saw that one on a list of recommended ones. I almost went with it. Let me know how it works. Of the 12 I set on February 10th, 4 I can see embryos in. I'll be ecstatic if they all 4 hatch. Time will tell!
I set 23 on Feb 11th. Only 1 was not fertile. All others are developing and still good. But I’ll get back to you on Day 21 about how that thermometer worked.
Hens go broody when you don’t want them to… and won’t go broody when you do. 