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- - Refractometer Question (http://www.tropicalfishkeeping.com/beginner-saltwater-aquariums/refractometer-question-103108/)
When I look at my in-tank hydrometer it reads .022 but when I test it in my refractometer it shows .024. Is it common to have that difference between the two. The refractometer has been calibrated per the instructions and I check it weekly.
Thats why we advise the use of a Refractometer. Hydrometers are not accurate.
great thank you.
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