Freshwater Temperature

FranM

I have been struggling to calibrate an Eheim Jager heater. I have a glass thermometer in the tank, and I also have a TDS meter. They both record a different temperature. Which one would you feel is the most accurate? (The glass says 82, and the TDS meter says 26 degrees C which is 78.8 F).

Thanks!

Fran
 

A201

The temp at the upper level of the tank is likely warmer than the lower levels.
If the glass thermometer is a quality name brand, I'd go with that reading.
A temp range of 78 - 82 degrees is safe for the majority of aquarium fish.
 
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FranM

The temp at the upper level of the tank is likely warmer than the lower levels.
If the glass thermometer is a quality name brand, I'd go with that reading.
A temp range of 78 - 82 degrees is safe for the majority of aquarium fish.
So yes I do have the thermometer about 4 inches from the top. It’s actually an Imagitarium brand so I don’t think it is anything spectacular. But it is also 2° cooler than the stick on one. I also have lots of surface agitation and the output from the Fluval is actually a third of the way down so I think I have some pretty good circulation. Thanks.
 
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ForceTen

Glass thermometer is by far the most accurate.
 
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FranM

Ok, thank you.
 
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