Find the lowest price for:       All ProductsCO2 Products     0.0 (0)   Add a review Red Sea CO2 Indicator   Hydrometer with Liquid Crystal Thermometer 1.010 to 1.030 specific gravity and 64-97 F by Red Sea. Versatile swing-arm hydrometer accurately measures both specific gravity and water temperature. Have a question? Ask the Experts! Compare Prices Product Spec Member Reviews Recommend to Friends Category Red Sea Aqua MedicAzooDennerleGerman Air Pressure SystemsHydorMarine Technical ConceptsRed SeaTunze--------Suggest a new option Something wrong in this page? Let us know! Related products: More Red Sea CO2 Products Other CO2 Products internal use: spec438