Hydrometer

[Cheesehead]

What is a good one for the price, and how do I calibrate it correctly? I have read many things from using ro/di water to some sort of calibration fluid.

 

[cichlid_king]

I have always had good luck with the Coralife hydrometer, and you just mix up some saltwater to season the needle, but you should definately look into a refractometer. They are far more accurate

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[Cheesehead]

lol meant refractometer.