Well this is not actually true. If you use a UTH for heat you wanna know the temp coming from the heat source not the ambiant temp or else you could burn your snake. If the ambiant temp in the tank is 90 the UTH could easily but above 120 or 130.Originally Posted by Mr. Misha
If you are heating from an outside source ( some people heat a whole room, instead of individual tanks, with space heaters) then measuring the ambient temp is fine.
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