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Old 01-08-2004, 11:32 AM   #1
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My salinity is 1.029

I use my Deep Six Hydrometer and set my tank to Salinity of 1.024. Just got my Refractometer last night and and lo and behold, its reads 1.029. Man, don't ever trust those hydrometer. I lost my yellow tank recently, wondering whether it could be the high salinity killing it.
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Old 01-08-2004, 11:38 AM   #2
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My instand ocean hydrometer read 1.025 and my refractometer said 1.028. I'm so glad I got one when I did, I'll never trust those little plastic hydrometers again.
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Old 01-08-2004, 12:32 PM   #3
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I had the same issue. My Deep 6 Hydrometer said 1.026, my refractometer said 1.032! I'm slowly bringing down my salinity as a result. Let's just hope that the refractometers are correct...
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Old 01-08-2004, 12:51 PM   #4
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Just as Hicmndr has said. If you find this to be the case, bring it down very slowly!! There are places to get those refractometers for $40 and less. A GREAT investment
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Old 01-08-2004, 05:54 PM   #5
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This is not condescending, some people simply aren't informed it needs to be done...when comparing the two for the first time...have you calibrated the refractometer with RO or distilled water?
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Old 01-08-2004, 05:56 PM   #6
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Yes, I did and its read 1 for distilled water before I test my tank. Actually, the instruction comes with the refractometer mentioned about the calibration.
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Old 01-08-2004, 06:05 PM   #7
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Mine appeared to be perfectly calibrated when I received it. I checked it with RO, and it was spot on. Also, not all refractometers adjust for temperature, so that could be a concern as well. Mine has ATC on it.
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Old 01-08-2004, 06:07 PM   #8
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Actually, the instruction

LOL, I would expect as much from female reefers...but since when do we read the instructions

Like I said before, I was not trying to condescend, simply making certain the instrument was calibrated before you move your salinity
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Old 01-08-2004, 06:15 PM   #9
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Also fellow reefers don't forget........ don't take the water sample from the surface, take it from 6 inches or better below the surface.

When you have a minute and have your refrac in hand, take a sample from the very top and then again from 6 inches down - you will see the difference.
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Old 01-08-2004, 08:45 PM   #10
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When you have a minute and have your refrac in hand, take a sample from the very top and then again from 6 inches down - you will see the difference.
Hmmmm, I've never done that before, will try it
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