Sera Oxygen-Test (O2) 15 Ml, 0.5 Fl.Oz. Aquarium Test Kits

Quick breathing at the water surface is an unmistakable sign for an oxygen deficiency. Unfortunately it may then already be too late for acting appropriately. The sera O2-Test monitors the actual oxygen level in the water within minutes and allows for acting in time. sera O2 plus provides quick oxygen supply. Sufficient for approx. 60 measurements.