Bulk Reef Supply

Double Junction Lab Grade pH Probe

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Why does BRS recommend this?

When it comes to probes not all are built alike.  We went through many different brands of probes to bring one in that we were comfortable putting our name on.  With high-quality materials, the BRS Lab Grade pH probes will last longer than most other standard grade probes while giving more consistent readings in between calibrations.


High quality, American-made pH probe to meet your saltwater aquarium needs.

  • Made in the US under strict quality control
  • Double junction designed specifically for contact with proteins or heavy metals
  • BNC connector with superior insulators
  • Cable has low noise design with conductive copper layer between braid and center conductor
  • Less frequent and quicker calibration
  • 10 Ft Cord


BRS Lab Grade pH Probe Features:

Double Junction Probe: A double junction probe has a second seal and junction found at the center of the probe. The double junction design adds to the cost and complexity of the probe but they are recommended in instances where the probe will come in contact with proteins or heavy metals. When these elements come in contact with the silver within the probe gel they can precipitate on the porous junction and clog it which can cause drift and shorten the life of probe.


The double junction design used in this probe has a second junction in the center of the probe which creates two chambers within the probe. The first one is filled with the reference gel containing mostly potassium chloride, silver chloride and reference probe. The second chamber has just reference gel containing mostly potassium chloride. This design prevents precipitation by keeping the silver away from the second porous junction at the bottom of the probe which is exposed to the aquarium water.


The BRS Lab Grade probe uses pelon strips as a junction material which is a true electrochemical insulator which allows a complete circuit between the reference probe and the tank but allows a very minimal transfer of elements found within the probe or tank. The pelon strip is also much easier to re-wet than the ceramic junctions in the case of accidental drying out of the probe.


The BNC connector is also made to higher quality specifications with superior insulators between the shell and center pin to reduce noise and increase accuracy. The outer shell on the BRS Lab Grade Probe is made using Ultem rather than less expensive polycarbonate which is what most probes use because it is the most inexpensive material available. The Ultem shell is a highly resistant material and inert to a wide range of materials making this one of the more chemically compatible options available for probes like this.


What's Included?

1x BRS Double Junction pH Probe 


*Calibration solutions sold separately

PINPOINT pH High Precision Calibration Fluid - American Marine Inc

Milwaukee pH Calibration Fluid - Single Use Packet

10.00 pH Calibration Fluid - Neptune Systems

7.00 pH Calibration Fluid - Neptune Systems

More Information
UPC 850000695566
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Product Questions

Will the probe work as is or does it need to be calibrated first
Question by: David Knight on Dec 5, 2023, 6:31 PM
Hi there, thanks for the question. This probe will need to be calibrated first.
Answer by: Grace (BRS Staff) on Jan 25, 2024, 11:26 AM
I am wondering will this probe work with my GHL P4 controller as a secondary for my calRX???
Question by: Marco Gipson on Nov 10, 2023, 2:25 PM
Hey there,
Thank you for reaching out to us. Yes, it will.

Please let me know if you need anything further and take care!
Answer by: Matt Lucero (BRS Staff) on Nov 17, 2023, 11:11 AM
Will this probe work with the Hydros Controllers that have the probe ports?
Question by: Kaleb Taylor on Jan 10, 2023, 4:54 PM
Hey there,
Thank you for reaching out to us. Yes, it will work with the hydros.

Please let me know if you need anything further and take care!
Answer by: Matt Lucero (BRS Staff) on Jan 12, 2023, 10:43 AM
Is this probe guaranteed to be fully submersible?
Question by: Cathy Albino on Jul 2, 2022, 9:03 PM
Thanks for the question! The probe end before the top cap with the cord is fully submersable, however, the cap end with the cord shouldn't be submerged long term but can withstand water briefly if dropped into the tank. Please let us know if we can help with anything else!
Answer by: Kyle Thomas (BRS Staff) on Jul 6, 2022, 11:19 AM
What is the proper installation angle of the ph probe? Can this probe be installed horizontally?
Question by: Ryan Lee on Nov 30, 2021, 1:44 AM
Hello there, great question. The probe should be installed in vertical position, using a probe holder is recommended to keep the probes secured. Happy Reef Keeping.
Answer by: Christian (BRS Staff) on Dec 1, 2021, 4:38 PM
What is the temperature range it can handle?
Question by: Don Johnson on Sep 7, 2018, 9:25 AM
Hey there!

We use this probe in reef tanks that have temperatures between 72-82 degrees. Anything outside of that I cannot say whether it can work properly.
Answer by: Thomas Billington on Sep 7, 2018, 2:11 PM
Will this probe work with a pinpoint monitor? and is it better than the pinpoint probe replacement? Thank you.
Question by: Cesar Muniz on Feb 13, 2018, 6:37 PM
Thanks for contacting BRS!
Our probe will work well with the Pinpoint pH monitor! Have a great day!
Answer by: Noah Winn on Feb 16, 2018, 9:51 AM
Will this be a suitable replacement for a Milwaukee MC122 PH Controller?
Question by: Zach Warner on Nov 20, 2017, 3:01 PM
This pH probe would work very well with your Milwaukee controller.

Happy reefing!
Answer by: Zack on Nov 24, 2017, 3:41 PM
Is this compatible with the Neptune Apex system?
Question by: Jon H on Nov 17, 2017, 9:53 AM
The great thing about most pH probes is that they use a pretty universal BNC connector. The Apex systems can use any standard pH probe, including the BRS probe.

Have a great day!
Answer by: Zack on Nov 17, 2017, 9:56 AM
Will this work with a Reef Keeper Lite?
Question by: Justin Rice on Nov 16, 2017, 6:06 PM
The BRS PH Probes are compatible with ReefKeeper SL1 and SLX modules. If your current probe has a BNC connector, it will be compatible.
Answer by: Charlie on Nov 18, 2017, 9:25 AM
Will this work with the Neptune system?
Question by: David Cordell on Nov 16, 2017, 11:50 AM
Our BRS pH probes are fully compatible with Apex Controllers. You will need to calibrate the probe, but it will work just fine.
Answer by: Charlie on Nov 18, 2017, 8:36 PM