- MPR Magnetic Probe Rack - Neptune Systems
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.
Probe rack fixes By Dmazz63 on 1/25/2019Dmazz63 would recommend this product to a friendGood design, just needs a little tweaking. I have also experienced the issues mentioned above with the screws swelling, the wet side crowning and causing it to spin and also rust inside the wet side magnet compartment. The screws and tapped holes can easily be fixed by re-tapping the tapped holes and running a die down the screws. They are 1/4-20 thread. I was amazed by how much plastic came out. The wet side magnet cover had to be chipped off and cleaned up the rust inside. You can then cut a 2 x 2 piece of 1/16" plastic (nylon). Leave the magnet loose inside the cavity and run a small bead of silicone or similar around the opening and a little dab in the middle of the magnet. Place the plastic piece in position and use the dry side magnet to clamp everything together. No more rust and the magnet is glued to the underside of the cover so it can't crown again and make the rack spin.
Great product By Torey on 8/30/2018Torey would recommend this product to a friendCan’t say it loud enough apex has some reason f the best looking and usable products. However make sure u don’t give the screw a monkey grip turn as I did. I cracked one of the probes.
This is PITA By Nathan on 6/25/2018Nathan wouldn't recommend this product to a friendI actually have 3 of these. 2 of them have swelled in less than a year and are no longer usable. Something inside the wet side has swelled up 1/4" or more and it is not round instead of flat against any surface. The other issue is that it likes to spin when bumped. So if you have probes or float switches in it, you can pull on a wire mistakenly and it will rotate the probe holder so nothing is in the water. 2 side magnets that held it straight would have been MUCH MUCH better. Also the screws are hit or miss on being tight or loose. Good luck!
nylon screws will swell By Timothy on 5/27/2018Timothy wouldn't recommend this product to a friendI've had this probe holder for about 6 months now. At 1st, i thought it was great. The magnet is strong, and the probes fit perfectly. One oversight they had with this holder is the hold down screw for the probes. The nylon screws will swell just enough to seize in the holder. I still use the unit, but will expect to break off the screws when cleaning. Of course you can chase the threads and replace the screws with something more durable.
Does the Job By Nicholas on 3/1/2018Nicholas would recommend this product to a friendMagnet is strong a secure, however the thumbscrews that hold the probe in place are impossible to to turn. I need to get a towel in order to get the to turn. Meaning that if i want to access 1 probe i need to pull the whole rack out of the tank.
Rusted By Ll on 2/16/2018Ll wouldn't recommend this product to a friendRusted and crashed my tank
Super Strong By Patrick Em on 8/27/2017Patrick Em would recommend this product to a friendHolds all my apex probes and keeps them in place. Makes everything nice and organized.
Magnetic Probe Rack MPR - Neptune Systems By vapor160 on 8/25/2017vapor160 would recommend this product to a frienddecided to splurge on this item when I got my Apex system. Very glad I did. works slick and keeps all the probes nice and neat and in one place. no more fishing around in the sump to find one that some how worked its way into a place I didn't want it.
These have worked fine for me By Randall on 8/10/2017Randall would recommend this product to a friendI've got three of these holders in my sump; one for probes, one for two-part, and a third in a different location for trace and vitamin additives. (Actually 4; the magnetic holder for the Apex ATK is the same.) They work great, very solid hold, won't move if you accidentally bump them gently. I agree with the other comment that the screw can get to be hard to turn, especially once they've been wet for awhile or if they become encrusted; just get a very short phillips head screwdriver and problem solved.
Magnetic Probe Rack MPR - Neptune Systems By vapor160 on 7/21/2017vapor160 would recommend this product to a friendworked like a charm. keeps everything nice and neat and in place. if you are going to spend the money on the probes, why not keep them secure in your tank.
Quality and Functionality By jpitch on 5/21/2017jpitch would recommend this product to a friendCouldn't ask for a better product
Nice but with a flaw. By Jim on 5/11/2017Jim would recommend this product to a friendThe rack fits nicely in my sump and the individual probes fit as noted. My problem is that the thumb screws are very tight. I need a wrench to tighten a couple. Otherwise it's a nice attractive probe holder.
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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
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.
Could this be used to hold tubing in place, like from a reactor or doser?
What are the sizes of the probe holes?
I see the are 2 doesn't sizes but it doesn't say what they are.
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.
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!