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Aeroway® Salinity Refractometer, Aquarium & Seawater – Dual Scale (1.0 to 1.070 S.G.)

Measure salt water or salinity of water, ideal for aquariums and marine monitoring. Features automatic temperature compensation (ATC),The main part is made of chromium, it's very durable. Measures on 2 scales, Specific Gravity (D 20/20) and parts per thousand (‰).