Neptune Systems Dissolved Oxygen probe
While the price of the Dissolved Oxygen Module – PM3 is quite reasonable, the downside is that the DO probe itself comes with a higher price tag. However, the DO probe certified and sold by Neptune Systems is a lab-grade device, which means you are getting quality.
Now, here is the good news: the probe features replaceable membranes. This means you do not have to dispose of it when it wears out, unlike other probes. Instead, every three months, you simply replace the membrane in the probe, making it a more sustainable option.