Red Sea Seawater Refractometer

Pet Pacific

$139.99 
SKU: PEP/RED/RED197

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specifically designed to measure the absolute salinity of seawater for marine and reef aquariums.Red Sea 's refractometer offers exceptional accuracy, using a specific algorithm designed for measuring seawater at a temperature of 25??C.

https://www.youtube.com/watch?v=ZDGtMqkDx-E