Some accutemp one Igot at home depot. an indoor/outdoor one. I use them all over the place and they're usually alright. I moved it to a different location in the brooder last night and when I checked it this morning it seemed to be more consistent with how it really feels in there. I put the weaker chick in a separate brooder for the night to keep her protected while she regained her strength enough to go back with the others. She was quite wobbly for a bit and the other 2 kept knocking her down if they bumped into her and I would have to help her get on her feet. See was in good shape this morning, seemed happy even. They're back together and all seems to be ok. I am keeping a closer watch today, too. So far, so good.
a close call for sure.