Salifert Oxygen Test Kit.

This is a quick and straight forward method to determine the oxygen levels in your aquarium or pond. The Oxygen Test Kit includes a test vial, three reagents and a color chart to measure the levels of oxygen from 2 to 14 PPM (mg/L). Contact with the test reagents should be avoided. This Oxygen kit will work with freshwater and marine aquariums and outdoor ponds. It will provide 40 tests.