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IQ 150 pH meter won't calibrate or calibrates slowly
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Last Updated
3rd of October, 2013

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The probe must be hydrated to function properly.  New probes, or probes that have had long periods of inactivity may need to be soaked in one of the pH calibration solutions to restore functionality.  Soaking for an hour should be sufficient.  This process can be facilitated if the solution is warmed up before soaking.
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