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Anybody have any positive experiences? I looked at Amazon and it seemed all over the board. Thanks.
 

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Most people will only be using the 7 pH solution for single point calibration. You only need both kinds for a two point calibration. Many pH pens, especially the cheaper ones, are not even capable of two point calibration.
 

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Since it is prone to going bad, I only use the small envelope priced at about a dollar each. That puts it in a range where I go for the convenience rather than where I can save the most.
 
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