View Full Version : Digital Thermometer Accuracy

08/18/2009, 05:04 PM
I have a couple Coralife digital thermometers. These seem to be common throughout the hobby and cheap. What have you all found? I compared it to a cheap glass therm, but was curious because I was going to get a new one for my refugium. Thanks

08/18/2009, 05:38 PM
i have 2 that seem accurate and one that jumps several degrees every few seconds lol so i guess it just depends

08/18/2009, 05:39 PM
i think they are pretty accurate.... i have 3 and just cause i was curious i put them all in the same tank for a while and monitered the temps. they all said the same thing throughout the day. im sure you can come across a defective or inacurate one, but i personally havent. i like them ALOT better than any old glass ones (which get absolutely covered in coraline alge making them impossible to read. very much so a pain in the butt. all the glass thermometers i ever had came loose within a month also and would not stick any more) soooo i vote just stay with coralife thermometers.

08/18/2009, 06:59 PM
i borrowed a friends to compare to mine, and the two were 4 degrees diferent....

Aqua Keepers
08/18/2009, 08:06 PM
The old glass ones are the most reliable/accurate. You'll find many threads here full of people who have probs with Coralife digital thermometers.

scuba guy ron
08/18/2009, 09:09 PM
Dr fosters shows this at +- 1.5 deg F. I've compared mine to the glass one and they read the same.


Aqua Keepers
08/19/2009, 12:32 AM
Those are the ones most people have probs with. I have read of people having them off up to 8*
I have one and every time I turn it off/on it gives a different reading.

Aqua Keepers
08/19/2009, 12:45 AM





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08/19/2009, 01:00 AM
I have them, I use them,

They all seem to be all within a 0.2 to 0.6 of each other.

I still like the PinPoint Temp better.

08/19/2009, 05:17 AM
I bought a Reefkeeper a few weeks ago, there was 3 difference between the RK and the coralife one. So I broke out my infrared thermometer and the RK was the correct one. I was slowly cooking my corals.

08/19/2009, 08:59 AM
IMO, they're useless.

scuba guy ron
08/19/2009, 10:28 AM
<a href=showthread.php?s=&postid=15555717#post15555717 target=_blank>Originally posted</a> by Psychographic
IMO, they're useless.
Mine matches the 2 old school glass ones exact. Not useless to me.

Aqua Keepers
08/19/2009, 06:03 PM
<a href=showthread.php?s=&postid=15556252#post15556252 target=_blank>Originally posted</a> by scuba guy ron
Mine matches the 2 old school glass ones exact. Not useless to me.

I would check them from time to time.

08/19/2009, 06:11 PM
Being built in China.. The Coralife thermos are fine for most uses. If you want reliable, as others have said the older style mercury filled glass ones are infallable.

08/20/2009, 03:12 AM
Your finger should be able to tell. No need for a thermometer anymore. Why buy a phosphate test kit if you have algae that you don't want?


08/20/2009, 07:05 AM
I have one that's accurate and reads the same as my old school glass thermometer, and I have one that is about 5 degrees off. From my experience, I really wouldn't trust them to be accurate.