What problems would I usually meet ? How to solve it ?

What problems would I usually meet ? How to solve it ?
2024-07-11 23:15:27 1. If the readings of zero dissolved oxygen liquid is not zero or close to zero, you can polish the cathode of the probe.
2. If the readings is not within normal range or the readings drifts, please check the membrane on the cap. If there are cracks, holes or contaminations on the membrane, please change the cap.
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