Hanna Salinity checker

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Charlie’s Frags

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So today I bought the Hanna salinity checker and it 1.029. I also tested with my 2 calibrated refractometer and the measure 1.026. Which should I trust?
 
www.dinkinsaquaticgardens.com
Never mind. It’s spot on with refractometers now. Apparently I didn’t calibrate the Hanna correctly the first time.
 

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