Sera O2 Test
Rapid breathing on the surface of the water is an unmistakable sign of lack of oxygen, unfortunately it may be too late for intervention.Ā sera OĀ 2Ā The testĀ proves the actual oxygen content of the water within a few times and allows early intervention.Ā For about 60 measurements in fresh, salt water and in a pond.Ā You can achieve a rapid increase in oxygen content withĀ sera OĀ 2Ā plusĀ .
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