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Products > Test Kits > Hydrometers and Refractometers 1 Items found Red Sea Hydrometer View> Description: Versatile swing-arm hydrometer accurately measures both specific gravity and water temperature. Clever design allows periodic or continuous reading of the most important water quality parameter in saltwater aquariums. Measure from 1.010 to 1.030 specific ... $9.99 In Stock (1) Quantity Add to Cart