01-11-2011, 05:21 PM
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Originally Posted by zof
I use the digital coralife with the temperature probe, cheap and seems to be pretty accurate.
I bought three Coralife digital thermometers for a research project. Trying them out, I placed them in my 55 gallon (with the probes within 1" of each other). Result: I had three different temp readings ranging between 76.2 to 78.5F.
Actually, that's about as accurate as a generic off-the-shelf thermometers get (+/- a degree or so), even the large (12"+) alcohol thermometers used in College Biology or Chemistry labs. The trick is to measure some known temperatures with the digital thermometer, careful not to damage the probe with too high a temp, and note the correction factor unique to the individual thermometer. I note the correction factor (example: +0.7) on the front with a silver Sharpie marker. The trick is finding something with a precise, known temperature! freezing is easy (use ice water), boiling is over the limit for most aquarium digital thermometers.
A difference in 1-2 degrees F or 1C is pretty insignificant, as far as fish and plants are concerned as long as the temp is consistent. Obviously, you don;t want the temp bouncing up and down rapidly!