Neptune Systems Double Junction ORP/REDOX Electrode Probe

The Neptune Systems ORP / Redox Electrode - Double Junction is an electrode that allows you to monitor ORP, replace your ORP electrode, or add one for another tank. The probe measures ORP in your aquarium with an Apex System or a PM1 module. You can replace a worn ORP electrode. It is recommended to replace your Lab Grade ORP probe every 18 to 24 months. This electrode can be used when adding another tank to your system or when you want to measure ORP in it.