Hanna Instruments HI 98186 - Manual (Page 28)

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Press CAL. The calibration menu will be displayed.
Press DO to select the DO calibration.
The DO calibration screen will be displayed and the standard 0% saturation
(or 0 mg/L, depending on the currently selected measuring unit), will be
automatically selected.
The hourglass icon will be shown on the display until the reading becomes
stable.
When the reading is stable and close to the selected standard, the CFM
functional key is displayed.
Press CFM to confirm the calibration point.
Press ESC to leave calibration. The instrument will return to the main screen
and will memorize the zero calibration data.
One point automatic slope calibration
It is suggested to perform the slope calibration in air. Allow the probe tip to
dry.
Press CAL. The calibration menu will be displayed. Press DO to select the DO
calibration. The 100% saturation standard (or the 8.26 mg/L standard,
according to the currently selected measuring unit), will be automatically
selected.