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What's a good cheap hydrometer to use? I have the Instant Ocean hydrometer but I find that it gives me very inconsistent & incorrect readings. Maybe I'm just using it wrong?

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If you go to reefcentral...in their sponsor page, Dr. Foster & Smith has an offer on small refractometers for only $35. I know thats more than a hydro, but still very cheap for a refracto...and wayyy more accurate and easier to use.

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