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Old 02-12-2007, 09:17 AM   #1
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refractometer accuracy?

so i just got my refractometer on friday and i tested my water with both the swing arm type and the new calibrated refractometer and they read 1.023 and 1.028. so now i am assuming i should go off the refracto and slowly start lowering my SG? i cant believe there would be that big of a difference.
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Old 02-12-2007, 09:42 AM   #2
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I went through the same thing when I first started with sw. I was using the swing arm, which showed a reading of 1.024. When a friend of mine used his refractometer, it showed a reading of 1.029. I don't trust the plastic swing arms. I also found out later on that micro bubbles will influence the reading on a swing arm. These typically form when you add water to a dry unit.
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Old 02-12-2007, 02:51 PM   #3
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Yes they will show about .05 difference. Mine did the same. Trust the refractometer. Make sure you calibrate it with some RO/DI water.
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Old 02-12-2007, 02:54 PM   #4
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thats the first thing i did even though they said it was calibrated when it left the factory. i never trust that saying.
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Old 02-12-2007, 05:51 PM   #5
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Mine was exactly .005 off. my hydro read 1.022 and the refracto read 1.028. I calibrated mine with distilled water. If you are going to lower the salinity, you can lower it quicker than bringing it up. Fish have a harder time adjusting to a higher salinity than adjusting to a lower salinity.
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Old 02-12-2007, 06:29 PM   #6
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right now it is at 1.026/7. what do you guys recommend it be at 1.025?
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Old 02-12-2007, 06:40 PM   #7
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I keep mine at 1.025 but I know folks on here keep theirs at 1.026 or 07 and it's not a problem at all--whichever you prefer.
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Old 02-12-2007, 07:58 PM   #8
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It's more important to keep it consistent than to keep it at a specific number. If your critters are happy then a stable 1.027 is fine and better than a fluctuating 1.025.
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Old 02-12-2007, 10:28 PM   #9
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I agree, stability is best. I keep my 55G FOWLR at 1.020 and my 125G (planning a few corals) at 1.025.
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Old 02-13-2007, 07:15 AM   #10
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Quote:
Originally Posted by mwrmma
what do you guys recommend it be at 1.025?
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