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  1. Default Thermometers - Digital vs Old School


    0 Not allowed!
    Hi All~

    Well amidst my 72g project I have purchased 2 digital thermometers and have a large variance between the two I have a good 1.2 degree difference between the two. I would love to find something that is accurate. I was wanting to monitor the temp in my sump and in the tank. Haha maybe I am making too much of this but it just bugs me when readings don't match.

    The two I have are a Coralife (the most accurate of the two but was .8 degrees high when tested spec says accuracy is +/- 1.5) The second is a Marina (it tested 1.2 degrees low I am sure it has a similar spec.)

    What do you all use and how accurate are they?
    Mike
    120g Mixed Reef In Progress
    120g Reef Journal
    55g Freshwater - Out of Service
    My 55g Tank Remodel Project
    72g Bowfront -Out of Service

  2. #2

    Default


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    I use old school glass thermometers in all of my tanks. They haven't failed me yet.
    Adventures in Aquaria - The KevinVA Story

    When in doubt, ask yourself... W.W.L.S (What would Lee Say)?

    Have a fish problem? Fill out and post this completed questionnaire in the General Aquarium Forum, when you start a new thread.

  3. #3

    Default


    0 Not allowed!
    Me too - I have one that suctions inside the tank to the glass. Not that people won't recommend digital ones though. Perhaps one of them is closer to a heater?
    46 gal fw tank with black skirt tetras, neon tetras, spotted corys, cherry barbs, otoclinus, snails & 4 amano shrimp - plastic & live plants
    5 gal QT
    Remember: Our job is to take care of the water our fish live in

  4. Default


    0 Not allowed!
    Quote Originally Posted by andreahp View Post
    Me too - I have one that suctions inside the tank to the glass. Not that people won't recommend digital ones though. Perhaps one of them is closer to a heater?
    Nope I tested them both side by side in the same location. I also did a calibration test using crushed ice and water - this will yield a 32 degree temp to check the accuracy of a thermometer. The Marina gave a 30.9 degree temp and the coralife gave a 32.7 degree temp. I like the digital ones for readability. I might try to open one to see if there is an adjustment on the board.
    Mike
    120g Mixed Reef In Progress
    120g Reef Journal
    55g Freshwater - Out of Service
    My 55g Tank Remodel Project
    72g Bowfront -Out of Service

  5. #5

    Default


    0 Not allowed!
    I use an old school glass one as well. The only thing I don't like about it is that I feel like it takes it a long time to adjust the temperature reading. What I mean by that is, I use a gallon water jug to refill my ten gallon tank when I do a water change. Our water has a tendency to swing in temperature so I have to recheck the temp of each gallon jug and it seems like the thermometer takes a few minutes sitting to reflect the correct temp.
    Does your digital themometer give an instant reading? I've been thinking of getting one for this exact reason. It won't hurt it to be off by a degree or two for waterchanges and it would be nice to have that peace of mind.
    ~Manna
    10 gallon live planted aquarium with 6 neons
    90 gallon fw community in progress

  6. #6

    Default


    0 Not allowed!
    crunchy, I get annoyed with my old-school one for that exact same reason, but I'm actually reading the temp of the water coming out of the faucet for my water changes (using a siphon).

    I typically place my glass thermometer on the opposite side of the tank from where my heater sits. That way I'll know the distribution of heated water is correct.

    I've seen digital thermometers differ in readings from the old school variety, as well - same tank, different reading. I'm more akin to believing the old school one, because I never see variations of the same water with different glass thermometers. I'm sure they're reliable... just not "as" reliable. ;P
    Adventures in Aquaria - The KevinVA Story

    When in doubt, ask yourself... W.W.L.S (What would Lee Say)?

    Have a fish problem? Fill out and post this completed questionnaire in the General Aquarium Forum, when you start a new thread.

  7. Default


    0 Not allowed!
    Yes it is pretty quick - maybe 10 - 15 seconds to stabilize.
    Mike
    120g Mixed Reef In Progress
    120g Reef Journal
    55g Freshwater - Out of Service
    My 55g Tank Remodel Project
    72g Bowfront -Out of Service

  8. #8

    Default


    0 Not allowed!
    That would be helpful for not wasting as much water as I do, just to read the temp. =X
    Adventures in Aquaria - The KevinVA Story

    When in doubt, ask yourself... W.W.L.S (What would Lee Say)?

    Have a fish problem? Fill out and post this completed questionnaire in the General Aquarium Forum, when you start a new thread.

  9. Default


    0 Not allowed!
    Glad I saw this thread with the pros/cons of the different thermometers. I honestly have never had a thermometer in my tank in it's 7 years. I was thinking I should probably pick one up eventually lol. I tend to rely on my heater because I have a Rena Smart heater that has different lights to tell me if my water temp is too high or low. I don't tend to worry about the temp difference in water changes because my tank is set to 75 and the general room temp in my house is 70-72 and I let my buckets of water sit and adjust to room temp before adding them to my tank and I have never had problems from fish stress. Is a thermometer really necessary?
    70 Gal Planted Rio Negro Angelfish Biotope with:
    1 Whip Tail Pleco
    7 Hatchet fish
    11 Glo Light tetras, 6 Black Skirted Tetras
    6 Bronze Corys
    3 Wild Type Angelfish
    Current Plants:
    Giant Amazon Sword, Narrow Leaf Java, Val, moss on driftwood


  10. Default


    0 Not allowed!
    I think they are very necessary unless you are in a region of the country where your temps stay consistent year round and you don't require a heater. While I do like to have something that is very accurate I mainly need it to determine that the temp is stable. The fact of the matter is that heaters do malfunction.... My light could be be green, indicating that all is good but the thermometer shows that the temp has dropped 5 degrees. I now know at a glance that something is amiss and needs attention asap. Well worth the $6 I paid for the thermometer.
    Mike
    120g Mixed Reef In Progress
    120g Reef Journal
    55g Freshwater - Out of Service
    My 55g Tank Remodel Project
    72g Bowfront -Out of Service

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