Acidity Sensors

Phil Eisermann [mazer at ix.netcom.com] says

Of course, if you have ever left your pH probe in your saltwater tank for any length of time, you'd find it was impossible to recalibrate. I know this from personal experience. They tend to last around 8 months or so. I have never had one last more than one year.

Keep in mind this will vary with the quality of the probe. I finally tired of replacing the $50 PinPoint probe twice a year. I store my probe in an "electrode storage solution" from Hach.

See also:

• sales-Remove- at KILLspamelectrodesdirect.com refers to

  http://www.electrodesdirect.com Factory-Direct Supplier of pH, ORP, Conductivity, Dissolved Oxygen, Ion Selective Electrodes, Meters, and Monitors for the laboratory, process, and biotechnology industries.

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• http://www.lazarlab.com/phpage.htm A useful booklet for anyone making pH measurements. You will find helpful hints on cleaning, storing, and calibrating pH electrodes and the type of electrode which is best suited for your particular sample. To get the FREE booklet go to and ask for it.
• http://www.coleparmer.com
• http://www.premiumaquatics.com
• http://www.algaeworkers.com/cgi-bin/loadpage.cgi?13828+/volts/probes.html
• http://www.jensalt.com
• http://www.acropora.com
• http://www.exoticfish.com
• http://www.marinedepot.com
• http://www.sasala.com/fish/electronic/index.html
• http://www.thekrib.com/Plants/CO2/co2-pvc.html Liquid acidity senseing.