Fishkeeper
Crowing
You should really get a thermometer, they're not that expensive and they can tell you a lot about what's going on.
As a temporary measure, a human oral thermometer could work. Just put the tip in the area you want to measure and hit the button. They can read air temperature when it's fairly warm.
As a temporary measure, a human oral thermometer could work. Just put the tip in the area you want to measure and hit the button. They can read air temperature when it's fairly warm.