Which thermometer to trust

Discussion in 'General Discussions and Advice' started by rakabos, 16 Jan 2012.

  1. rakabos

    rakabos

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    So i have been wondering about my water temps since one of the 300W Jager's stopped working.

    I have a Marina thermometer which is reading 24C at the moment in the water. I also have a Buyo suction one that reads 29C. Then I have a cheapie bought on Ebay which reads 28C.

    The heaters are set at 27C.

    What the heck must i trust? Would getting one of those floating mercury types ones give me a more correct reading?

    :cursing::cursing::cursing::cursing::cursing:
     
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  3. belindamotion

    belindamotion Google Master

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    I have the same problem...I've got 1 that reads...today...26.2C...on the one side and the other one reading 27.5...and the cheap "stick on one" that has colour changes on 26,27 and 28...:censored: ...I've got the glass floater, but stopped using that as it reads say.. 26*C...now is that 26.1 or 26.9...? LOST...My heater is unplugged, so I'm still at a loss to the Temp difference...:(
     
  4. rakabos

    rakabos Thread Starter

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    Is there a trusted brand that one can get at a local LFS?
     
  5. butcherman

    butcherman Moderator MASA Contributor

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    All thermometers can become uncalibrated, most reliable imo is the glass alchohol type but even then there is margine for error. At work i have to have the master thermometer recertified every 6 months!
     
  6. belindamotion

    belindamotion Google Master

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    I honestly don't know...all I see at the different LFS are the same brands..just slightly different prices...I thought Digital would be more accurate...but hence my disapointment when I got 2 and both are giving me different readings...:eek:
     
  7. AfricaOffroad

    AfricaOffroad

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    Take an average of the 3 readings:p
     
  8. rakabos

    rakabos Thread Starter

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    Lol average is 26 so im golden LOL.

    No seriously are the mercury ones more accurate?
     
  9. belindamotion

    belindamotion Google Master

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    :lol::lol::lol:..that's what Hubby does...I err on the side of caution and take the highest reading...which leaves me in a permanent state-of-panic...:eek:
     
    Last edited: 16 Jan 2012
  10. Nemos Janitor

    Nemos Janitor

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    You can get a digital thermometer from the chemist at a very reasonable price. Else you get the TDS - temperature combo pens from your local LFS.
     
  11. Nur

    Nur Starz

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    I use an Aqua Medic digital and a standard old school one. It varies by 0.5 degrees. So all I want is for both to stay the same difference all the time. Then I know it's accurate.
     
  12. mytank

    mytank

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    How accurate are the digital ones from the chemist ?
     
  13. Nemos Janitor

    Nemos Janitor

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    Not 100% sure. But I would assume they need to be very accurate because they are ment to measure humans temperature. ;)
     
  14. mytank

    mytank

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    :) I'll go check the specs I would assume one that is at least 0.5 accuracy. Want to calibrate my profilux temp sensor
     
  15. rakabos

    rakabos Thread Starter

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    The ones from the chemist. Do you mean the ones u stick in your ear?
     
  16. Nemos Janitor

    Nemos Janitor

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    Yes there are other places you can stick them in.:biggrin:
     
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  17. rakabos

    rakabos Thread Starter

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    hehe like under your arm hey :p
     
  18. rakabos

    rakabos Thread Starter

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    are those waterproof though?
     
  19. Nemos Janitor

    Nemos Janitor

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    I used one I got from Clicks a few years back for quite a long time untill I got the combo TDS/Temp pen.
     
  20. rakabos

    rakabos Thread Starter

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    Great thx. That will be a very good way of testing what the actual temp is and which thermometer to trust. Peroni for u! :peroni:
     
  21. rakabos

    rakabos Thread Starter

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    So....

    I picked up 2 thermometers, one the glass type filled with mercury/alcohol, and one patch type that you stick on the side of the tank.

    My "trusty" always used thermometer was showing 26C. Stick in the two new ones and they read 31C. How wonderful, my tank had been running at 31C and I was thinking it was at 26C. So just to verify i went to pick up a baby type one at Dischem and same result, 31C.

    I had experienced some coral bleaching, I'd say 2% of my coral, and I have A LOT of coral lol. I should have seen the signs in the tank i guess.

    And I was using 2 x 300W Jagers set to 25C... So lesson learnt. Dont just trust your thermometer blindly!!!
     
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