Of all the organisms in your aquarium, large fish are the most acutely at risk to low O2 levels. In some situations with heavily loaded systems, simply the failing of a skimmer can bring the O2 levels down to dangerous levels and cause a chain-reaction fish die-off . This is where the PM3 Dissolved Oxygen module comes to the rescue.
The Neptune Systems Dissolved Oxygen Probe is a probe which measures dissolved oxygen in the water. This probe is meant for the Dissolved Oxygen Module – PM3. The probe is certified and lab graded. The membranes in the probe are replaceable as well, which should be changed every three months.
* The Dissolved Oxyen probe ONLY works with the PM3 module