Bulk Reef Supply

Double Junction Lab Grade ORP 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 ORP probes will last longer than most other standard grade probes while giving more consistent readings in between calibrations.


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

  • Made in the US under strict quality control
  • High-grade platinum rod
  • Double junction designed specifically for contact with proteins or heavy metals
  • Longer lifespan than single junction
  • 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 ORP 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 ORP Probe


*Calibration solutions sold separately

PINPOINT ORP (Redox) 400 Calibration Fluid - American Marine Inc.

More Information
UPC 850000695559
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Product Questions

What's the warranty on the double junction probe?
Question by: Michael Gayle on May 18, 2022, 8:29 PM
Hey Michael, thanks for reaching out to us! The warranty on these is 1 year through us
Answer by: James Johnson (BRS Staff) on May 19, 2022, 10:12 AM
Does these probes come calibrated? Can the Pinpoint calibration solution be used to calibrate these with an Apex? Since some of the BRS probes are recommend, more information should be presented such as calibration fluids to use, and details on if the probes are factory calibrate prior to shipping.
Question by: Rich on Dec 30, 2021, 10:06 AM
Hello Rich,

Thank you for the question and suggestions. Calibration should always be perform when connecting a new Probe or Switching controllers. You can use the American Marine PinPoint, Neptune System Apex or the Milwaukee PH calibration fluids. Thanks
Answer by: Christian (BRS Staff) on Dec 30, 2021, 11:36 AM
Are the BRS probes compatible with apex?
Question by: Christi on Nov 23, 2017, 4:08 PM
Our BRS ORP and pH probes are compatible with Apex Controllers. They are compatible with almost any controller that uses a BNC style connection. : )
Answer by: Charlie on Nov 24, 2017, 9:20 AM
Can this be used with the digital aquatics, reef keeper, slx module.
Question by: Victor on Nov 3, 2017, 11:13 PM
Hi Victor, great question.
All of our probes use standard BNC connectors so these will work with the Reefkeeper.
Answer by: Nick on Nov 25, 2017, 2:21 PM