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#1
05-10-2012, 06:06 PM
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refractometer calibration
I've always calibrated my refractometer using plan old RO water and although I knew some error would be involved I was under the impression the amount would be so small it would not make a difference. However I keep hearing more and more lately people stating after reading a few articles that this isn't the case and you need to calibrate your refractometer with some kind of calibration fluid otherwise you'll be off a noticeable amount.
Just wanted to share that after receiving some PINPOINT Salinity Calibration Fluid to calibrate my conductivity probe I stuck some in my refractometer and it's it reads exactly 1.026 as it should, not even out the slightest bit as far I can tell. So regardless what articles my suggest it seems I can conclude that RO water is certainly an acceptable calibration solution. Anyone else try this and get similar or different results? 
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#2
05-10-2012, 08:33 PM
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Yes, my refractometer came with 18 megaohm water(pure) for calibrating at 0, I compared that to my RODI and it was the same, I bought calibration fluid after reading (probably the same) an article and checked the calibration and yes it was correct. All 3 gave the same results, so now I can use my RODI water to check my calibration fluid.
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Crap happens, that's why they sell toilet paper in 48 roll packs!
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#3
05-10-2012, 09:49 PM
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What is calibration fluid? Sounds like RO water in a fancy container with a pretty label for a stupid amount of $$$. Somebody always out to make a buck...lol Good to know this has been double checked, I always use RO water to check mine. Thanks for posting....
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#7
05-10-2012, 10:09 PM
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Quote:
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#8
05-10-2012, 10:18 PM
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Quote:
but water quality varies where ever you go, so personally wouldn't use tap water for my refractometer especially considering the poor water quality we have in Wetaskiwin
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I'm not 'fallow' you must be talking about my tank!
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#9
05-10-2012, 10:36 PM
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The refractometer is for salinity. Try it and see what it says then compare to you RO, if the numbers are the same, then I would say either is fine for calibrating it. If you get different numbers then just use your ro.
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#10
05-10-2012, 11:49 PM
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It should be able to test for both salinity & specific gravity.
I believe that the proper water temp should also be part of the equation for calibrating. Please correct me if I am wrong.
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 Greg
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