Sera O2 Test Kit size-20l this uniquely balanced formulation helps

this uniquely balanced formulation helps support immune system health

Compared to standard non-LED lighting

or 300 includes a replacement ceramic filter media allotment

Includes batteries

They are extremely compact with just 6

Sera O2 Test Kit size-20l this uniquely balanced formulation helpsQuick 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.