If you accidentally store the probe in purified water try storing the probe in 3m kcl storage solution for 48 hours and see if the tester can perform in a normal state. Also store your electrode in a ph 4 0 buffer 3m kcl or 3m kcl buffer that is slightly acidic. Apera instruments 3m kcl storage solution is made with high purity chemicals designed for conditioning and extending the service life of ph or orp electrode.
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