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01-15-2008, 10:19 AM
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#1
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Little Fishy
Join Date: Nov 2007
Location: Hampstead, MD
Posts: 447
Reviews: 2
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Need an Accurate Thermometer
I thought my $6 Coralife Thermometers were doing okay until last night. I paniced when the thermometer was showing 75deg F. Before I turned up the heaters which were already set to 78deg F (two 200w visitherms in a 55g standard tank with ambient temperature of 70), I added a second coralife thermometer which read the temperature as 80.2deg F. That's a huge 5deg difference! Now I'm not even sure if either are correct. What's a dead on accurate digital thermometer to get?
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01-15-2008, 08:49 PM
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#2
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Reefless Reefer
Join Date: Jun 2002
Location: Durham, NC
Posts: 20,559
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i have had great luck with a $10 digital thermometer from Radioshack. heck get 2 of them so that you can compare.
G~
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Think Tanker
Friends Don't Let Friends Use Refugiums!
Reef Knowledge Impaired
"J" crowd member.
My Build Thread
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01-15-2008, 08:56 PM
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#3
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Carpe Noctem
 
Join Date: Feb 2007
Location: Western Colorado
Posts: 8,201
Reviews: 25
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I have six digital thermometers and not one is within a half degree of another  I finally used a old floating thermometer that I put in the fridge and compared it to a laser temp sensor and decided it was the most accurate, so I calibrated my Neptune to the same temp as the old floating thermometer that was so popular in the 70s 
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Hop~
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01-15-2008, 11:20 PM
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#4
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Little Fishy
Join Date: Nov 2007
Location: Hampstead, MD
Posts: 447
Reviews: 2
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Quote:
Originally Posted by Geoff
i have had great luck with a $10 digital thermometer from Radioshack. heck get 2 of them so that you can compare.
G~
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Reef safe? I ended up ordering a pinpoint wireless thermometer, but I'll check them out too. I'll see how it goes compared to the $2 temp floater I got in there now. I stopped using floaters because I've had them break after the suction cup goes bad and they get tossed across the tank by a powerhead.
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01-15-2008, 11:53 PM
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#5
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.
Join Date: Dec 2005
Location: NW
Posts: 11,333
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you will have a couple degree variance in the Pinpoint ones as well. If its any more than that thye will mail you a new one.
when you get it simply take a glass of ice...fill it with water and stir for 30 seconds. put the probe in. it should say 32 degrees. you will know from that point forward how far off that specific probe is and read it accordingly. I have 3 of those pinpoints all reading off the same monitor and like them. but there is 3 degrees difference between the low and the high one
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I like to glue animals to rocks and put disturbing amounts of electricity and saltwater next to each other
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01-16-2008, 12:07 AM
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#6
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Pinch That Penny
Join Date: Mar 2007
Location: Redmond Oregon
Posts: 2,240
Reviews: 2
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glass floating thermometer
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Home of the $0.00 Nano 
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01-16-2008, 05:53 AM
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#7
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I've got the REEF rash!
Join Date: Nov 2004
Location: New Jersey
Posts: 34,135
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Quote:
Originally Posted by luvmylo
glass floating thermometer
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Accurate and it never needs batteries.
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01-16-2008, 08:55 AM
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#8
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spaceman spiff
Join Date: Feb 2006
Location: south of Dimples
Posts: 10,631
Reviews: 72
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Quote:
Originally Posted by Loverotties
Accurate and it never needs batteries.
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but if they're glass, they can break. That happened in my last tank, and the steel shot went all through the sump. Fortunately it was steel, though, and I got it all up with the business end of a mag float.
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01-16-2008, 09:10 AM
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#9
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Little Fishy
Join Date: Nov 2007
Location: Hampstead, MD
Posts: 447
Reviews: 2
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Here's the good news. I reviewed the Coralife thermos on the website that i bought them from and before the day was out, they emailed me back saying they are crediting my account for the full price of all four of the thermos that I bought! That's awesome service that will bring my business back. Not that I ever blamed them before for the quality of the product that I bought. Too bad I already ordered the pinpoint from another store because I found a better price.
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01-16-2008, 10:09 AM
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#10
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Reefless Reefer
Join Date: Jun 2002
Location: Durham, NC
Posts: 20,559
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Quote:
Originally Posted by OIIIIIO
Reef safe?
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why wouldn't the thermometers be? i think we have gotten a bit to "Reef Safe" happy lately.
G~
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Think Tanker
Friends Don't Let Friends Use Refugiums!
Reef Knowledge Impaired
"J" crowd member.
My Build Thread
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01-16-2008, 12:09 PM
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#11
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Carpe Noctem
Join Date: Feb 2007
Location: Western Colorado
Posts: 8,201
Reviews: 25
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Just in case there was any confusion... I use my glass floating thermometer to ensure that my digital ones (Neptune) are calibrated correctly. So my Neptune right now reads 78.9 and the digital one in the wetroom that I am unable to calibrate reads 75.7. So I know the one in the wetroom is about 3 degrees off. I do not leave the floating one in the tank
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Hop~
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01-17-2008, 12:02 PM
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#12
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Little Fishy
Join Date: Dec 2007
Location: PA
Posts: 310
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Quote:
Originally Posted by OIIIIIO
Reef safe?
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unless you can find one thats so old it still uses mercury, It should be safe, I think any thermometer manufactured in recent history uses alcohol.
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01-17-2008, 12:04 PM
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#13
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Pinch That Penny
Join Date: Mar 2007
Location: Redmond Oregon
Posts: 2,240
Reviews: 2
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Quote:
Originally Posted by Geoff
why wouldn't the thermometers be? i think we have gotten a bit to "Reef Safe" happy lately.
G~ |
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01-29-2008, 08:49 AM
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#14
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Salty Supply TRT Sponsor
Join Date: Sep 2007
Location: Orlando, Florida
Posts: 602
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ive used the coralife digital thermometer for years with no problems  |
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01-29-2008, 07:50 PM
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#15
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Big Fishy
Join Date: Jan 2007
Location: New York
Posts: 671
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Quote:
Originally Posted by Fly Guy
you will have a couple degree variance in the Pinpoint ones as well. If its any more than that thye will mail you a new one.
when you get it simply take a glass of ice...fill it with water and stir for 30 seconds. put the probe in. it should say 32 degrees. you will know from that point forward how far off that specific probe is and read it accordingly. I have 3 of those pinpoints all reading off the same monitor and like them. but there is 3 degrees difference between the low and the high one
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Debs 
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