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Old 06/15/2015, 11:39 PM   #1
Registered Member
Jyetman's Avatar
Join Date: Nov 2012
Location: Phoenix, AZ
Posts: 1,709
Store credit going towards Apex Salinity Probe

Finally after six months of trading in frags got $100 store credit. Decided to add to my apex a salinity probe. Going one part at a time so bought the PM2 module first. Figure since I'm not spending cash on this add on and if its like many say unreliable no major loss. Hope I didn't make a mistake are they more reliable these days?

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Old 06/16/2015, 12:55 AM   #2
SPS Addict
xdestry's Avatar
Join Date: May 2014
Location: Pasadena, CA
Posts: 662
It's not too exact honestly, I had a lot of problems with mine when I first got it and had to get it replaced. Sometimes if I moved it around it will shoot up to 45.. its useful for long term monitoring of the salinity to see if its going down or up but dont count on it being exactly 35, expect a 1 or 2 ppt difference from what a refractometer will show.

100 gallon MIXED / SPS frag dominant

Current Tank Info: 100 Gallon + 40G Sump, ATI Sunpower Dimmable 8x39 (B+,C+,B+.Act.B+.P+.Gieseman Super Act, B+), 2x MP40QD, Aquamaxx Q2 + ConeS CO1 Skimmers
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Old 06/16/2015, 01:18 AM   #3
Pirates Cove Reef
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Join Date: Feb 2009
Location: Cypress, CA
Posts: 2,582
The set point being dead on is not the beauty, it is showing a trend of going up and down and if it goes down rapidly you can set a alarm.

A tip on refractometers, keep a bottle of 35ppt reagent in each of your sumps to temp calibrate your refractometers as temp change can add up to large differences and you should calibrate them often.

Scott Steinberger
There is more than One Way to skin a Reef!

Current Tank Info: Pirates Cove 400 Gallon Peninsula with 10 Ecotech Gen 4 Pro Lights, SPS heavy mixed Reef, Tank Controlled by Apex back up monitoring by Profilux, Tropic Marin Pro Salt, Brightwell Suplements and Bio Bricks, Way too many Fish! Keep it simple!
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Old 06/16/2015, 06:02 AM   #4
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Join Date: May 2012
Location: Brooklyn, NY
Posts: 1,424
Also the probe is very susceptible to interference. Make sure that no cords go near the probe wires.

Just started Red Sea Reefer 350 (75 Gallon) Build Thread -

Current Tank Info: Red Sea Reefer 350
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apex, apex pm2, salinity probe

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