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How can I test the life left in my pH probe?
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Last Updated
10th of January, 2012

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A simple test can be performed using Windex glass cleaner with ammonia and any type of soft drink.  The procedure is as follows:  Turn your meter on and place the probe in a soft drink which is acidic (phosphoric or citric acid per label) and the reading will be from 2.7 to 3.9 pH; then go to the Windex with ammonia which is alkaline.  Your meter LCD display should move very quickly up the scale to 10.5 to 11.8 pH.  If the probe slowly moves up the scale then it is time to consider replacing it.
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