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John HendersonJul 27, 2025
Why does my YSI 550A Measuring Instruments display “Over” or “Undr” during calibration?
- KKristen CharlesJul 27, 2025
If your YSI Measuring Instruments displays “Over” or “Undr” during calibration, try replacing the membrane and electrolyte and recalibrating. Cleaning the probe electrodes may also help. If the problem persists, the system may need to be returned for service.
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