Refractometers and the color of light used: important!

Discussion in 'Water Chemistry' started by Mr. Bill, Sep 28, 2014.

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  1. Mr. Bill

    Mr. Bill Native Floridian

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    I don't typically link to threads from a different forum, but considering the trustworthy source and the urgency of the article, I believe it's important for such information to be shared in any manner possible.

    "So the color effect on refractive index is as large as the entire difference between salt and fresh water."

    http://reefcentral.com/forums/showthread.php?t=2445582
     
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  3. Billme

    Billme Eyelash Blennie

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    Thanks for posting this Mr Bill. I'll no lounger go between the florescents in the garage to natural light to 10k light of the aquarium to read the refractometer.
     
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  4. DSC reef

    DSC reef Giant Squid

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    Ha! I knew I wasn't crazy! I was bouncing between rooms testing with different light sources and could never get the same reading. Thanks Mr bill, this proves my sanity.
     
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  5. Mr. Bill

    Mr. Bill Native Floridian

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    You're welcome. :)
     
  6. Todd_Sails

    Todd_Sails Giant Squid

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    Mr. Bill, Mr. Bill,.... ( you have to use that squeeky voice from SNL),

    Now it's time to use my calibration fluid, and look at the difference between the different lights I might use and see how much it differs.

    Thanks for the share! And, it was from the Dark Side too!
     
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  7. DSC reef

    DSC reef Giant Squid

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    I wonder if there's a difference between 0 tds water or calibration fluid? The directions on my red sea refractometor says to use ro and says nothing about fluid. Honestly, the nicer test kits I've invested in has seem to make it harder to read my tanks params? Maybe it's just me
     
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  9. Mr. Bill

    Mr. Bill Native Floridian

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    I knew someone would have to go there... :mad::p:rolleyes::D

    You're welcome. :)

    IIRC, calibration fluid is actually 35ppt. Calibrating with 0 tds can give a false reading with some models.
     
  10. DSC reef

    DSC reef Giant Squid

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    I wonder if the red sea model doesn't require it then. Makes me nervous but I guess if I needed it the instructions would tell me.
     
  11. Todd_Sails

    Todd_Sails Giant Squid

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    My Refractometer, reads about -.02 with 0 TDS water, when I calibrate it with my 35ppm calibration fluid!
     
  12. DSC reef

    DSC reef Giant Squid

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    Do you have the red sea refractometor todd?