Sera Test O2 - Oxygen - Drop test

For easy determination of oxygen content in fresh water

Rapid breathing at the surface of the water is a sure sign of a lack of oxygen. Unfortunately, it may already be too late to act.

The will Test O ₂ gives the actual oxygen content of the water in a few minutes and allows you to act in time. will be O ₂ more quickly increases the content.

Sufficient for about 60 measurements.