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Page 2 of 2 FirstFirst 12
Results 11 to 19 of 19

Thread: Who do i trust

  1. #11

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    0 Not allowed!
    I use a calibratable waterproof pocket thermometer to spot check all of my tanks temps, similar to this one, there's many out there, just make sure it's easy to calibrate

    https://www.amazon.com/Comark-Instru...r+calibratable

    Calibrate easily with ice water

    https://www.foodrepublic.com/2011/04...d-thermometer/

    They are also very handy to have on hand when checking tap temp, before refilling a tank during a WC
    Last edited by Slaphppy7; 02-16-2019 at 03:56 PM.
    10 Gallon Beginner Tank... Journal
    40 Gallon Breeder: ... Journal
    29 Gallon: ... Journal

    “If there are no dogs in Heaven, then when I die I want to go where they went” - Will Rogers

  2. #12

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    0 Not allowed!
    I use to run the modern temp probes.
    Ended up finding them way to inaccurate, so when back the the old school glass mercury ones.

  3. #13

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    1 Not allowed!
    Can't buy the mercury ones in the States anymore, all of the glass ones here are alcohol filled...and not the most accurate
    10 Gallon Beginner Tank... Journal
    40 Gallon Breeder: ... Journal
    29 Gallon: ... Journal

    “If there are no dogs in Heaven, then when I die I want to go where they went” - Will Rogers

  4. #14

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    0 Not allowed!
    Whether filled with mercury or alcohol, if a glass thermometer breaks inside the tank, your fish are in big trouble.
    20 gal. high: planted; 5 white cloud minnows, 4 golden White Clouds, several RCS, 2 blue shrimp, 5 Amano shrimp, several snails; Azoo air. 65 gal: planted; 6 rosy barbs, 6 yellow glofish, 3 red glofish, 3 zebra danios, 5 white cloud minnows, 3 dojo loaches, 6 crimson spot rainbow fish, 12 large Amano Shrimp, several snails; AC110.

  5. #15

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    0 Not allowed!
    Quote Originally Posted by mermaidwannabe View Post
    Whether filled with mercury or alcohol, if a glass thermometer breaks inside the tank, your fish are in big trouble.
    Are you taking about it affecting water quality and poisoning the fish? That didn't happen to me when my oscar broke the glass thermometer after biting it. It tore his skin on his lips, and I removed the broken pieces out after it had been sitting in the tank for a few hours. I've known other folks who had their big fish break the thermometer and find it broken the next morning. No health issue to the fish.

    Back to the OPs question. Digital thermometers can be off just like analog thermometers that aren't confirmed to have been calibrated. The best thermometer is the one calibrated by the manufacturer to the proper standard like a NIST certified thermometer. The calibrations do "expire" and are not guaranteed for the life of the thermometer.

    https://www.thomassci.com/scientific...ed-Thermometer

    Be aware that taking the temperature at the surface doesn't guarantee that the bottom temperature of the tank is the same, and most of the time it is cooler by a degree or so.
    Last edited by Rocksor; 02-25-2019 at 02:44 PM.

  6. #16

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    0 Not allowed!
    Quote Originally Posted by Slaphppy7 View Post
    I use a calibratable waterproof pocket thermometer to spot check all of my tanks temps, similar to this one, there's many out there, just make sure it's easy to calibrate

    https://www.amazon.com/Comark-Instru...r+calibratable

    Calibrate easily with ice water

    https://www.foodrepublic.com/2011/04...d-thermometer/

    They are also very handy to have on hand when checking tap temp, before refilling a tank during a WC

    You should calibrate the thermometer for both boiling and ice method.

    https://www.iddba.org/training-mater....aspx?ext=.pdf

  7. #17

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    0 Not allowed!
    Quote Originally Posted by Rocksor View Post
    Are you taking about it affecting water quality and poisoning the fish? That didn't happen to me when my oscar broke the glass thermometer after biting it. It tore his skin on his lips, and I removed the broken pieces out after it had been sitting in the tank for a few hours. I've known other folks who had their big fish break the thermometer and find it broken the next morning. No health issue to the fish.

    Back to the OPs question. Digital thermometers can be off just like analog thermometers that aren't confirmed to have been calibrated. The best thermometer is the one calibrated by the manufacturer to the proper standard like a NIST certified thermometer. The calibrations do "expire" and are not guaranteed for the life of the thermometer.

    https://www.thomassci.com/scientific...ed-Thermometer

    Be aware that taking the temperature at the surface doesn't guarantee that the bottom temperature of the tank is the same, and most of the time it is cooler by a degree or so.
    If either mercury or alcohol leaks out into the water, I would think it would be deadly. And the shards of broken glass could injure fish, as well. If your fish weren't poisoned, it was probably because none of the liquid leaked out, though it did tear his lip. If they swallow any glass shards, they're in trouble, too. I'm just not sure that glass thermometers are the safest to use in aquariums.

    That said, I use the adhesive strip thermometers that you attached to the outside of the glass. The squares change color with the changes in temperature. Since I have coldwater tanks, it isn't as critical as with tropicals.
    20 gal. high: planted; 5 white cloud minnows, 4 golden White Clouds, several RCS, 2 blue shrimp, 5 Amano shrimp, several snails; Azoo air. 65 gal: planted; 6 rosy barbs, 6 yellow glofish, 3 red glofish, 3 zebra danios, 5 white cloud minnows, 3 dojo loaches, 6 crimson spot rainbow fish, 12 large Amano Shrimp, several snails; AC110.

  8. #18

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    0 Not allowed!
    The thermometer was broken in multiple pieces in the middle so I'm pretty sure that the alcohol leaked out. The oscar was only 4" at the time.

    I wouldn't use it in the same aquarium as big fish, but for little community fish 1-2" there's no way for them to break it.

  9. #19

    Join Date
    Mar 2019
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    0 Not allowed!
    Hi rookie,

    I would be inclined to put my trust in the glass thermometer. Low-cost electronic digital thermometers are notoriously inaccurate. Unfortunately, people are misled by the one decimal place resolution. So, in your case, this is the .2F part of the 82.2F. It may give one decimal place resolution but could still be (and often are) only accurate to +/- 3F. I have bought several low-cost digitals over the years and they vary wildly in their readings. In the end, I purchased a certified accuracy digital thermometer of +/-0.2C.

    JPC
    Last edited by jaypeecee; 03-29-2019 at 05:35 PM.

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