thermometer help

[carttman]

How do I determine what a suitable outside temp is for a 30 gallon tank set with a digital thermometer. I have the type of temp. guage that will alarm if the temp goes out of range, and I'm not sure what I need to set the outside temp. for. I have the water temp. set for a range of 72-80 degrees, and the real water temp. is set for 75 degrees based of of the heater.

[NJ Devils Fan]

The outside temperature doesn't matter because the heater will make the water warmer if it gets too cold.

[125gJoe]

Is your thermometer an Indoor/Outdoor? Meaning, does it measure the tank water as well as the room temperature?

[JSchmidt]

Is this a gadget that sounds an alarm if the temp goes above or below a given range (e.g., 72-80)? If so, I wouldn't want the temp to exceed 84 or so without knowing about it. I think it would get pretty hard for the fish to get oxygen past that point.

Jim