Originally Posted by Kaidalen
I know how to cycle a tank, but heres my question a different one, how can you read the thermo, marina sticker that tells you the temp of the tank? its just a black strip that you put outside of the tank, how do you read it, as it its not a usual thermo
The temperature on those stick on thermometers is read by looking at the strip, the temperature is indicated by the relevant number "lighting" up a colour. Its pretty obvious what the temperature reading is, see my photo.
You are correct they can be affected by air temperature, but generally they are considered accurate enough for an aquarium temperture. If you are worried get another type of aquarium thermometer. I use battery powered digital thermometers also, but there are also the hang on glass types with a liquid display. I tend to find at most half a degree difference betwern the stick on type and a digital type.