Neptune Systems

MPR Magnetic Probe Rack

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Neptune Systems designed the MPR - Magnetic Probe Rack specifically for the Apex. It will hold the larger diameter temperature probe, pH probe, ORP probe, and salinity probe.

  • Made from acrylic and with strong neodymium magnets
  • Works securely on sumps and aquariums up to 1/2" thick


Dimensions - 4" long by 2.5" deep with the screws all the way backed out.


Neptune has designed a Magnetic probe rack that will hold up to 4 probes with one hole being slightly over-sized to hold those larger probes like the Neptune temp probe. By simply placing the MPR in your sump or tank, you can now securely hold all your probes in a single spot. If a probe is left loose their is a good chance it may float with the business end being exposed to the air and causing a false reading. The Neptune MPR can work with glass up to 1/2" thick and keep all your probes secure and safe.

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UPC 748252991409
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Product Questions

Are the magnets covered with acrylic? That would be the orange on the outside surface where the 2 units attach together. Having the ecotech mp60 wave maker, I am going to glue a probe holder on the tank above the wave maker cord, and attach the cord to one of the probe holes. This will prevent the outer unit of the mp60 from falling, and breaking, if the flimsy velcro that holds them in place should come off.
Question by: audrey on Oct 8, 2017, 6:41 PM
Hey there,
Thanks for getting in touch with us in regards to this product. The outside is covered with acrylic and has a thin rubber pad where it touched the glass. I can say that I personally would use the small adhesive clips that come with the MP60 in order to prevent the dry side from falling. Please let me know if there is anything else that we can assist with. Thanks!
Answer by: Tyler Schafer on Oct 15, 2017, 9:51 AM
Could this be used to hold tubing in place, like from a reactor or doser?
Question by: Corey McMullen on Jun 5, 2017, 8:31 PM
While not specifically designed for this purpose, the thumbscrews do allow you to tighten them pretty far down, and would probably work fine for this purpose. Another alternative that we have found to work very well for this is the Bubble Magus Tube Holder Bracket.


Happy reefing!
Answer by: Zack on Jun 13, 2017, 2:53 PM
What are the sizes of the probe holes?

I see the are 2 doesn't sizes but it doesn't say what they are.
Question by: Allen Ford on Jan 19, 2017, 8:47 PM
Great question! There are three holes that fit the standard pH, salinity and ORP probes and there is one larger hole that fits the Neptune Apex temperature probe. The standard probe holes are 0.5" and the temp probe hole is 0.65" :-)

Answer by: Randy on Jan 24, 2017, 5:38 PM
Can i get the complete dimensions. Need to know if this is going to fit in my biocube. I need the Length across and the width when the screws are clear of the holes. Thank you
Question by: Joseph on Jul 30, 2014, 1:31 PM
Hi Joseph,
The inside portion of the probe holder measures 4" across. With the screws backed out as far as they go (so at its thickest) it measures 2.5" inches.
Answer by: Bulk Reef Supply on Jul 30, 2014, 1:31 PM