I have 2 thermometers. One is the accurite therm/hygrometer combo in the bator from walmart. The other one is thermometer only with a wired probe sensor placed inside the water jiggler made by oregon scientific from target. I run the probe through the vent hole and velcro this one to the front of the bator for easy reading when I walk by the bator. Each one costs about $8. Temperature wise, they seem to be accurate which is surprising (I made a comparison to the thermometer brought home from the lab at work which is much more expensive).