If KCl is not available can KI be used to store pH probe meters? Both are potassium salts.

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    $\begingroup$ If I remember correctly, $\ce{KCl}$ is used due to the diffusion coefficients of both ions being similar, but I might be wrong though. $\endgroup$ – Felipe S. S. Schneider May 22 at 19:19
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    $\begingroup$ @FelipeS.S.Schneider You are correctly pointing to Hittorf's ion transfer numbers (e.g., en.wikipedia.org/wiki/Ion_transport_number). $\endgroup$ – Buttonwood May 22 at 20:14

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