Neptune Systems

PM1 pH/ORP Probe Module

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pH/ORP Probe Expansion Module for the Neptune Systems Apex

  • Compatible with all Apex Systems
  • Dual Functionality: Choose Between pH and ORP Monitoring
  • I/O Port for Breakout Box Connection
  • 2 AquaBus Ports


pH/ORP Probe Port

The PM1 can be used with either a pH or ORP probe, depending on what you're looking to monitor. For example, if you're running two aquariums near each other, you can connect a pH probe to the PM1 and run both tanks off the same Apex system. Or maybe you have a calcium reactor and need to monitor the pH inside to automate a CO2 solenoid. Alternatively, you could connect an ORP probe and automate specialized equipment like an ozone generator.

Temperature Probe Port

This module also features a temperature probe port. An additional temperature probe allows you to monitor the temperature of another aquarium or even the temperature of the ambient air around your aquarium, depending on where you place the temperature probe.

I/O Port

The PM1 Module features an I/O port, which is how you can connect your Apex to the Breakout Box, one of the most underrated and underutilized Apex accessories. The Breakout Box allows you to connect up to 6 different switches or buttons to trigger feed modes, timers, and more.


What's Included?

PM1 Module

3' AquaBus Cable


Note: Probes and accessories sold separately

More Information
UPC 696859110979
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Product Questions

Does this unit include an aquabus cable?
Question by: Christopher Penrod on Dec 14, 2021, 2:21 PM
Thanks for reaching out. yes. The PM1 includes a 3' Aquabus cable.
Answer by: William Glenn (BRS Staff) on Dec 16, 2021, 12:41 PM
I would like to add a second ph probe and my EB8 has no available aquabus slots. Can the aquabus connection be made to an open slot on the Apex unit?
Question by: Russ Feilzer on Nov 15, 2016, 2:22 PM
Great question! You can plug this module into any open Aquabus port. If you have an open one on the Apex Head unit, you can utilize it. :-)
Answer by: Randy on Nov 15, 2016, 2:51 PM

Does the module come with a standard probe? Or do I have purchase it separately?
Question by: Robert on May 8, 2016, 4:19 PM
Great question!
This will only include the Module itself without the probes which are sold separately. Feel free to let us know if you have any further questions!
Answer by: Connor on May 10, 2016, 6:03 PM
Is this compatible with the Apex Jr?
Question by: Kenyi on Jul 30, 2014, 1:39 PM
Hi Kenyi,
It sure is. The only detail is that Apex Jr has a 5 module maximum, so if you already have 5 modules, then you cannot add any more (PM1 or any other type). If you don't already have 5 modules, then you can add it no problem.
Answer by: Bulk Reef Supply on Jul 30, 2014, 1:39 PM
can i use a tenp probe on this too
Question by: jordan m on Jan 3, 2014, 5:01 PM
Hi Jordan,
The PM1 does come with a port for an additional temperature probe as well (probe sold separately).
Answer by: Bulk Reef Supply on Jan 3, 2014, 5:01 PM