PH Probes

BRS

 

Anemones, Clowns, & Corals

 

I've seen a higher failure rate on the BRS branded probes, but they are 50% less.  Considering that you probably have automation tied to the values returned from the probe, I would spend a little more and get a higher quality probe.  The American Marine pH probe is a decent one.  
American Marine pH Probe - $45
http://www.bulkreefsupply.com/store/r.html
Neptune Sys Regular Grade pH Probe - $45
http://www.aquacave.com/standard-grade-ph-probe-brby-neptune-systems-1242.html
Neptune Sys Lab Grade pH Probe - $69
http://www.aquacave.com/lab-grade-ph-probe-brby-neptune-systems-1243.html
I believe that AC&C stocks the Neptune brand probes and members get a 10% discount...(which more than covers sales tax, and gives you an excuse reason to drive up to his store /DesktopModules/ActiveForums/themes/_default/emoticons/smile.gif  )
--AJ