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! Set Price Alert Compare Prices Product Spec Member Reviews Recommend to Friends Searched Red Sea CO2 Indicator in 150 stores, 50 results found Image Description   Store   Price CO2 Bio System Indicator Refill from Red Sea If this item doesn't belong here, click Remove and help us keep our results accurate.   arcatapet.com   0 Store Reviews   $4.33 Go to Store Red Sea Fish Pharm Ltd. 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Foster and Smith   7 Store Reviews   $9.99 Go to Store Hydrometer with Digital Thermometer - Red Sea Fish Pharm Ltd. If this item doesn't belong here, click Remove and help us keep our results accurate.   PetBlvd.com   0 Store Reviews   $10.27 Go to Store Red Sea Fish Pharm Ltd. Red Sea Co2 Indicator If this item doesn't belong here, click Remove and help us keep our results accurate.   Allpetdepot.com   0 Store Reviews   $10.77 Go to Store Red Sea Co2 Indicator Refill. If this item doesn't belong here, click Remove and help us keep our results accurate.   Pet Crossroads Pet Supplies   0 Store Reviews   $10.77 Go to Store Red-Sea-Fish-pHarm CO2 Indicator [Real Time CO2 Monitor] If this item doesn't belong here, click Remove and help us keep our results accurate.   Mail Order Pet   0 Store Reviews   $10.91 Go to Store Red Sea CO2 Indicator If this item doesn't belong here, click Remove and help us keep our results accurate.   Big Al's Online   0 Store Reviews   $10.99 Go to Store .Red Sea HYDROMETER W/THERM If this item doesn't belong here, click Remove and help us keep our results accurate.   Pets Warehouse   0 Store Reviews   $11.22 Go to Store Co2 Indicator - Red Sea Fish Pharm Ltd. 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