Reliable and accurate oxygen test for fresh and saltwater systemsMaintain proper oxygen level for healthy water conditionsDetect and prevent harmful oxygen deficit conditionOxygen is vital for a healthy aquatic environment for fish and plants. Tetratest O2 lets you measure and monitor oxygen concentration to ensure proper oxygen levels for healthy fish and plants and efficient biological filtration. Detect harmful oxygen deficient conditions and prevent potential loss due to oxygen-poor conditions. 30 tests. For fresh and saltwater systems.Please note: This item is shipped by standard ground service only. We apologize for any inconvenience.Please click on "More Information" for general information, instructions, and specifications.

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