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Sybon Opticon Series Salinity Refractometer - FG100sa Whole Grain Suzie's CBD Treats Extra StrengthMonitoring the salt concentration in your marine or reef aquarium is crucial to maintaining a healthy and successful system. While your average swing arm hydrometer can be used to measure this important parameter, more discerning aquarists demand greater accuracy from their water testing equipment. Part of Sybon's Opticon Series, the FG100sa Salinity Refractometer is a high precision, dual gauge instrument that accurately measures salinity (0 100 ppt)