I have a thermometer/hygrometer, but it isn't an Acurite. I've actually searched both of the surrounding Wal-Marts here and I've not been able to find one, so I got a Fluker's digital instead. Its only drawback is it doesn't have a probe, so I'm probably just going to end up ordering an Acurite online. To make sure the UTH isn't too hot I've just been laying my hand on it, and playing with the dimmer. I can feel the pretty significant changes, so I've kept it at what doesn't feel too hot, but will still give enough warmth to keep the temperature up and keep him snug. He seems to be staying ontop of it, too, not really going near the cool side of the tub.