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  1. #1
    Senior Member tiffany's Avatar
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    Question PH pens and Refractometers.

    I am thinking of getting a Ph pen and refractometer, and was wondering what you use to calibrate them and how expensive it is.
    A RS here said the liquid (?) to re/calibrate the refractometer is almost as expensive as the refractometer.
    And you need to use distilled water to calibrate the ph pens.
    Is this true?
    "The significant problems we face cannot be solved at the same level of thinking we were at when we created them."
    - Albert Einstein (1879-1955)

  2. #2
    Senior Member Flame*Angel's Avatar
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    You can calibrate a refractometer with plain RO/DI water. If you don't have a unit just borrow a cup from someone who does. It should last you two years

    The pH pens need calibration fluid. I believe the last time I bought it it was under $2 a pack (they come in little foil packages - you need two, I usually get 7 and 10).
    Susan

  3. #3
    Senior Member tiffany's Avatar
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    Thanks, I have RO not RO/DI water is that ok?
    Interesting about the calibration fluid......I'll look into that further.
    do you find them useful and worth the $$'s?
    "The significant problems we face cannot be solved at the same level of thinking we were at when we created them."
    - Albert Einstein (1879-1955)

  4. #4
    Senior Member Flame*Angel's Avatar
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    Distilled water will do. Don't use ordinary tap water or spring water.

    Definitely worth the money, I couldn't imagine running my tank without them.
    Susan

  5. #5
    Senior Member thien's Avatar
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    if you use distilled water to calibrate PH pen, what is the PH of distilled water?
    thanks.
    thien

  6. #6
    Senior Member thien's Avatar
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    oops...just re-read...Distilled is for hte refractometer not hte pH pen
    thanks.
    thien

  7. #7
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    Distilled water has a pH of 7.

    You need to buy buffer solutions. For a 3 point calibration I'd recommend a 4, 7, 9 buffer or something close two it.

    If you use "only" distilled water for a calibration. You will find that only readings taken at a pH close to 7 will be accurate.Every other reading could be inaccurate. I'm not sure what kinda of pH probe you have although I'll assume it's a glass electrode. They constantly need to be calibrated, especially the cheap ones.

    If you want NIST traceable buffers I can help you out.
    45 Gallon
    x2 96WPC Lights, x2 9W over CPR fuge, x1 36W T5 Actinic
    Remora C skimmer, Ehiem Cannister
    Solon Wrasse,Yellow Tang, Clarkii Clown, Blue Neon Goby, Mandarin
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  8. #8
    Senior Member CanadianGuy's Avatar
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    Yep I love my refractometer too! The instructions just say to use distilled water. It came with a tiny little vial of "super pure water"...I'm sure it will evaporate before I have to use it all! If you get one you won't regret it!

    I don't have a pH pen but I would like to get one as well.

    Grimstalk,
    What range is a pH pen good for? I have both SW and FW...I'm assuming that I'll need one for each type of water?
    James...

    "Knowing is half the battle!" ~ G.I. JOE

  9. #9
    Senior Member tiffany's Avatar
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    I saw the best deal on A/c both for around $114....
    I'll be getting one in a week or two.
    I lurve gadgets and especially those those ones that you can live without, but make life easier....
    "The significant problems we face cannot be solved at the same level of thinking we were at when we created them."
    - Albert Einstein (1879-1955)

  10. #10
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    You should not have to buy a pH probe/meter for fresh, and another for salt. Any glass or fet electrode should cover the full range (0-14)

    If you buy a pH probe/meter try make sure it's temperature compensated. Non compensated = inaccurate.

    Paper test strips they may be have specific ranges, 0-7, 7-14.
    45 Gallon
    x2 96WPC Lights, x2 9W over CPR fuge, x1 36W T5 Actinic
    Remora C skimmer, Ehiem Cannister
    Solon Wrasse,Yellow Tang, Clarkii Clown, Blue Neon Goby, Mandarin
    Assorted Zoo's,Shrooms,Rics, LPS

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