Obtaining correct tempreture readings

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I am getting conflicting tempreture readings which is causing stress (to me) as well as my fish i'm sure. I have a small grey digital battery operated thermometer which has a white lead prob. I also have one on those cheaper glass floating thermometers. They differ by 4 degrees. What should I do. Spend money on good water heaters which have their own inbuilt thermometers or buy more expencive thermometers with supposidly cheaper heaters. My system is 200litres so should I have 2 smaller heaters or just 1 large? I realise the more one spends the better the product but we all know about budgets so maybe someone has a good working combination.:whistling:
 

jacquesb

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Hello Gemma - The digital thermometer would be the more correct one of the two. I have seen on someone's tank where they have both as well, I have seen the same phenomenon. I would rather believe the digital one.

BUT - I have been to Ivan's house - saw his tank (Irie Ivan) and he have shown me that even the digital thermometers become less reliable over time....
 
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I use/buy the floating alcohol ones and check all the store has and buy one that shows the average. Even on the shelf they differ quite a few degrees.
 

Mike

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Personally i would buy two smaller heaters, and look at buying a fairly expensive thermometer (not thousands but something decent you know you can rely on.)
 

viper357

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I use/buy the floating alcohol ones and check all the store has and buy one that shows the average. Even on the shelf they differ quite a few degrees.
Yip, my LFS had a stock of about 15 digital thermometers, I think only 3 or 4 showed the same temp, the others were all different.

Personally i would buy two smaller heaters
I agree, Murphys law if you have one heater it will fail in the middle of winter on the coldest day of the year :p Buy 2 smaller ones so you have a backup should one fail.

I personally have a floating thermometer, a cheap digital one and a Tunze temperature controller, they are all different by a degree or so. It's best just to work on a sort of average but most importantly is not to have large temperature swings in the aquarium.
 
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Just remember from all the water parameters temperature is the most important. So it is worth while to spend some money on it.
 
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So how can one check/calibrate our temperature equipment. just having 2/3 different type of thermometers, is never going to be accurate. You would have to have at least 10 to get a statistically correct mean.

And 10 would still allow huge error % to skew the mean result, ideally you would need 100 thermometers, which is just crazy.

Any ideas ?
 

viper357

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So how can one check/calibrate our temperature equipment. just having 2/3 different type of thermometers, is never going to be accurate. You would have to have at least 10 to get a statistically correct mean.

And 10 would still allow huge error % to skew the mean result, ideally you would need 100 thermometers, which is just crazy.

Any ideas ?
Go expensive I suppose. Other that that I suppose a test in a lab environment. Out of all of mine I would tend to trust the hell expensive Tunze temp controller as being the most accurate, well it should be for the price!
 
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Get a thermometer that is stated with an accuracy of less than or equals to 0.2C - they tend to be more expensive but typically very good. Look at Hanna - they have several ranging between R500 and R2000
 
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Until they break in your tank like mine did. Try picking up 1000 small lead balls in water.
 
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Oops That Must Have Been Hectic, Fish Having Discussion In Your Tank, Hey! Whose Got A Shotgun? Ps Did You Lose Any Fish Because Of It?
 
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They Come Without The Bearings Too , But I Suppose One Must Be Carefull Not To Put Them In A High Flow Area
 

dendrosa

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I think this is where the various reef clubs could help out. Why not have a calibration session at a meeting? This could also be done for hydrometers. Although I have a refractometer, I find a glass bulb hydrometer usefull when making up saltmix. 'm sure there are people within each club who would have access to lab grade measuring devices and could set up a calibration tank for these instruments
 

jacquesb

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Hi everyone - just to add another bit of my thoughts here - take into account that the life we keep are extremely adaptable, IF things happen VERY slowly. I would think that it is MORE important to keep the temperature with a narrow range, if not the SAME, than the exact accuracy of the temperature gauge you might or might not be using?

Or am I drunk?
 
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Hi everyone - just to add another bit of my thoughts here - take into account that the life we keep are extremely adaptable, IF things happen VERY slowly. I would think that it is MORE important to keep the temperature with a narrow range, if not the SAME, than the exact accuracy of the temperature gauge you might or might not be using?

Or am I drunk?

I would agree with you, and you`re probably drunk, hehe
 

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