Does anyone actually keep a thermometer in their brooder for chicks?
I do - I keep digital thermometers in the inside brooders with tiny babies. I have a big outdoor thermometer hanging in my greenhouse that I can check without opening the door. I also have heat in there connected to a thermostat so I can set it to keep a certain temp. It has been so worth the money I spent on it. I set it on 70 degrees and it keeps the temp within 3 degrees either way. Perfect for warm days and cold nights.