Find the lowest price for:       All ProductsHydrometers and Refractometers     3.2 (21)   Add a review Instant Ocean SeaTest Hydrometer   Hydrometer 1.000 to 1.030 specific gravity by Instant Ocean. Swing arm style is easy to use and read specific gravity Have a question? Ask the Experts! Compare Prices Product Spec Member Reviews Recommend to Friends Category Instant Ocean AquaticLifeCoralifeHagenInstant OceanJBJMarine DepotVital Sine--------Suggest a new option Something wrong in this page? Let us know! Related products: More Instant Ocean Hydrometers and Refractometers Other Hydrometers and Refractometers internal use: spec455