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Oxygen is as important to fish life as human life. Dissolved oxygen (DO) refers to the oxygen gas that dissolves in water. Fish absorb DO directly from the water into their bloodstream through their gills.Easy to use. This kit perform approx120 tests. dissolved oxygen testing kit, testing kit of dissolved oxygen, do test kit, dissolved oxygen testing kit near me, dissolved oxygen testing kit in west Bengal, testing kit of dissolved oxygen in Kerala, dissolved oxygen test kit, dissolved oxygen kit.