I am using a laser temperature reader. Obvously that's not the technical name, but that pretty much describes it. You point it at a spot and it measures the temperature at that spot, and it is extremely accurate. I know it's not the best, but I am "makeshifting" at the moment, and I would say that those are the straight air temps (nothing from in the hide box). And the mouse was not discernibly different from the previous mouse, although I suspect he may have gotten a little fatter due to free access to food. I have noticed that the 3rd of the trio seems to have a gut that he may have developed over the past 2 weeks. Also, I forgot to mention that my Ball was born in October, so he is very young. The mice are testing the limits of the "no food wider than the snake" rule, but they aren't any bigger than that. I would have preferred a slightly smaller mouse, but I am cursed with a city that has very little variety in feeders. These were the smallest I could buy (including frozen, which he doesn't eat anyway).