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RE: PH Controllers/Monitors?

     I purchased a Pinpoint ph monitor a year ago.  At first, I was very 
     pleased with the ease of use.  However, it sent me into a panic the 
     first time I got some very low readings from it in my discus tank.  I 
     think I must have changed all the water in the tank twice before I 
     realized that my monitor was giving a bad reading.  My monitor 
     requires frequent calibration, at least once a month.
     If you do decide to get a monitor, I have found calibration solutions 
     at my local chemical supply store in 500ml bottles for a lot cheaper 
     than from any fish store.
     Trey in Tulsa