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#8
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![]() Refractometers should be calibrated with a seawater calibration fluid.
Swing Arm Type Hydrometers are only good for hockey pucks Pinpoint Meters... no comment but I gave up using them a long time ago. Floating hydrometers I don't use either. Make sure the GHL Cond probe is cleaned and swish it through the calibration solution to get rid of any air bubbles. Cheers, Tim
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