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Old 01-12-2017, 6:37 PM   #21
JennM JennM is offline
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Join Date: Sep 2000
Posts: 9,494
City: Canton
State: GA
Occupation: Hillcrest Teardrop Campers, H2O Distributors & The Fish Store.
Other Interests: Geocaching, Gold Panning, Kayaking, Camping
Specific gravity in the ocean can vary.

Having said that, calibrating a refractometer with 35 PPT solution will keep you close enough to the acceptable range, versus using RO/DI water to 'tare' it.

Not all refractometers are created equal. I have one I've had for over 15 years, that I used to use multiple times a day (in my shop) and when I checked it with solution it never really varied. Then I've had others, new out of the box, that needed to be tweaked every time - they didn't hold a calibration well.

Specific gravity can and does vary in the ocean so as long as you're close and consistent, things will be OK - but as some have mentioned, if something goes wonky and your SG is way low or way high, that causes problems.

This is a situation where common sense should prevail.

I'm not sure if LFS will calibrate with solution for you - I did when I had my place. It's a good idea to check it regularly, and yes, calibrating with a solution with a known specific gravity is best.


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