I don't sweat it. I put a thermometer in the brooder under the lamp and adjust the height of the lamp to get it right and check when it is cool. This is before I get the chicks. I do raise the lamp some when they get bigger, but I do not use a thermometer. If the brooder is big enough for them to be able to find their comfort level, it does not matter if one area is a little too warm and an area is too cool. They will adjust.
Don't try to keep the whole brooder at what you consider the perfect temperature. Let them decide where their comfort zone is. Why make it harder on yourself than you have to?
Don't try to keep the whole brooder at what you consider the perfect temperature. Let them decide where their comfort zone is. Why make it harder on yourself than you have to?