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View Full Version : Digital Thermometer Accuracy


edaskalos
08/18/2009, 06:04 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

milkit
08/18/2009, 06:38 PM
i have 2 that seem accurate and one that jumps several degrees every few seconds lol so i guess it just depends

100%hydrophylic
08/18/2009, 06:39 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.

o0jmadr0x0o
08/18/2009, 07:59 PM
i borrowed a friends to compare to mine, and the two were 4 degrees diferent....

Aqua Keepers
08/18/2009, 09:06 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, 10:09 PM
Dr fosters shows this at +- 1.5 deg F. I've compared mine to the glass one and they read the same.

http://www.drsfostersmith.com/product/prod_display.cfm?c=3578+3744+12089&pcatid=12089

Aqua Keepers
08/19/2009, 01:32 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, 01:45 AM
http://www.reefcentral.com/forums/showthread.php?threadid=1480339&perpage=25&pagenumber=1

http://www.reefcentral.com/forums/showthread.php?threadid=1511203

http://archive.reefcentral.com/forums/showthread.php?postid=9894506

http://mail.reefcentral.com/forums/printthread.php?threadid=1572219&perpage=16

http://reefcentral.com/forums/showthread.php?threadid=1589702

Want more???

Flipper62
08/19/2009, 02:00 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.

Bignasty1
08/19/2009, 06:17 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.

Psychographic
08/19/2009, 09:59 AM
IMO, they're useless.

scuba guy ron
08/19/2009, 11:28 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, 07:03 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.

azsaltman
08/19/2009, 07:11 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.

cloak
08/20/2009, 04:12 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?

;)

jtrasap
08/20/2009, 08:05 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.