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Old 05-13-2011, 09:52 PM   #11
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Originally Posted by Mr. Limpet View Post
Nope, use distilled water. .97 a gal. at Target.
That's fine if you only want it calibrated at 0 but it will be off at 35ppt (by about 2 ppt).

You do need calibration fluid if you want it calibrated for saltwater.
PINPOINT® Salinity Calibration Fluid - English
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Old 05-13-2011, 11:46 PM   #12
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Quote:
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That's fine if you only want it calibrated at 0 but it will be off at 35ppt (by about 2 ppt).

You do need calibration fluid if you want it calibrated for saltwater.
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Are you talking "part per trillion"? Is it possible a $24 refracto can even get that close?
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Old 05-13-2011, 11:48 PM   #13
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I calibrated with ro water and natural sea water.
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Old 05-14-2011, 09:39 AM   #14
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Quote:
Originally Posted by Mr. Limpet View Post
Are you talking "part per trillion"? Is it possible a $24 refracto can even get that close?
PPT = part per thousand. The average salinity on and around the reefs is 35 ppt.
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Old 05-14-2011, 09:58 AM   #15
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I'm with ccCap. I'd recommend calibrating to a known salinity (the calibration fluid) than calibrating against the zero salinity of distilled or ro/di water.
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Old 05-14-2011, 11:41 AM   #16
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Why would calibrating with distilled water make your results inaccurate? I'm not saying that I don't believe you I'm just saying I don't see how that would skew results since distilled water has a concentration of 1.000.
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Old 05-14-2011, 11:47 AM   #17
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PPT = part per thousand. The average salinity on and around the reefs is 35 ppt.
Gotcha. So if you use calabration fluid, what do you adjust the setting to? With dist. water I set it to 1.000.
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Old 05-14-2011, 01:55 PM   #18
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Why would calibrating with distilled water make your results inaccurate? I'm not saying that I don't believe you I'm just saying I don't see how that would skew results since distilled water has a concentration of 1.000.
The easiest way to describe it is because plain water and salt water refract (bend) light differently. A refractometer measure how much the water bends the light.
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Gotcha. So if you use calabration fluid, what do you adjust the setting to? With dist. water I set it to 1.000.
Calibration fluid is 35ppt. So when you put it on the refractometer it should read exactly 35ppt.
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Old 05-14-2011, 03:21 PM   #19
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Dang well I already ordered it so I guess I'd have to place another order and pay the shipping to get the fluid. That kinda sucks but oh well
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Old 05-14-2011, 03:21 PM   #20
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I was going by the instructions which says use distilled water, but I may have to try the calibration fluid just to see how accurate this one really is.
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