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Ph probe

Milwaukee makes a great portable one that's between $20-30. I store the tip in calibrating solution and only have to recalibrate it occasionally. It's hand held, so no continual readings, but it's worked for me. I'm sure others will chime in.
 
Like this only cheaper.
ImageUploadedByReef2Reef Aquarium Forum1377998883.026302.jpg
 
Sorry, don't know where to get one of those. Maybe try brs.com.
 

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