In-Situ smarTROLL Multiparameter Handheld Operators Manual - Manual (Page 38)

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The dissolved oxygen sensor cannot be calibrated using the
Quick-Cal procedure.
4. Tap OK.
5. Fill the calibration cup to the fill line with Quick-Cal solution.
6. Place the instrument into the calibration cup, and tap Start.
7. When the calibration is stable, tap the Accept button.