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Old 12-30-2004, 07:06 PM   #1
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Hydrofractometer

I got my new portable refractometer in the mail today. I used it to measure specific gravity and it is measuring almost 1.030! My hydronomer is only measuring 1.023. Which should i trust? Would this high salinity effect the fish and how?

By the way, I DID calibrate the refractometer
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Old 12-30-2004, 09:39 PM   #2
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I posted in your other thread. Trust the calibrated refractometer everytime.
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Old 12-30-2004, 10:52 PM   #3
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Yes, as long is it was properly calibrated trust the refractometer.
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Old 12-31-2004, 12:01 AM   #4
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my SG was tested with the same refractometer and was also high, but my hydronometer said it was just right. so, if the refractometer is always right, does that mean that hydronometers are always wrong?
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Old 12-31-2004, 12:03 AM   #5
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Usually that is the care.
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Old 12-31-2004, 10:46 AM   #6
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Quarryshark meant to say CASE!

and he is correct as usual!
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Old 12-31-2004, 11:36 PM   #7
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Hey I get my water from the ocean and when i use the hydrometer to check it says 1.023. That means myne must be right.
right?
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Old 01-01-2005, 12:44 AM   #8
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Not necessarily. It may be correct today and not tomorrow or even 10 minutes from now. Then again it may be correct all the time. Check the same sample with a calibrated refactometer and you'll know for sure.

BTW, the ocean does not have a 1.023 SG everywhere. Different oceans have different SGs and it varies from day to day....

Check out this article.
"Different oceans have slightly different specific gravities. The tropical Indo-Pacific has an average specific gravity of 1.022 - 1.025. The Caribbean has an average specific gravity of 1.023 - 1.026. The Red Sea has an average specific gravity of 1.028 - 1.035. The specific gravity changes in each area are due largely to rain fall."
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Old 01-01-2005, 12:56 AM   #9
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cmor is right, there are places that get some rain, and there are places that get NO rain, which would result in vaperation, and having the salinity rise, and when it rains alot, the salinity will lower, since there is no salt in fresh water
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Old 01-01-2005, 07:55 PM   #10
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I'm almost certain i calibrated it correctly but just to make sure I want to ask. I measured a sample of RO/DI water and it read 1 SG. So i knew it was calibrated. Correct?
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