A refractometer calibrated with 0 TDS water @ room temp. is more than accurate for mixing saltwater, I've seen people with systems anywhere from 1.022 to 1.027 and everything is living.
Lets face it, we're mixing seawater not rocket fuel.
Swing arm testers should be banned, they are a waste of recycled plastic.
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Crap happens, that's why they sell toilet paper in 48 roll packs!
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