Xylem HandyLab 780 - Manual (Page 66)

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Oxy
Zero Calibration
(Zero calibration with oxygen-free medium, e.g. nitrogen 5.0)
1) Place sensor in oxygen-free medium and wait for a stable measured value.
2) Press Start softkey. Calibration will be performed.
3) Finally, you can Apply these values or Cancel the calibration.
Data Entry Calibration
(Calibration by entering known sensor values)
1) Press Start softkey.
2) Adjust the known sensor values for zero and slope.
3) Finally, you can Apply these values or Cancel the calibration.
Note: To abort calibration, you can press meas at any time.
Calibration