Hanna Instruments HI 120 - Manual (Page 25)

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The fourth pH calibration buffer:
The fifth pH calibration buffer:
Notes: • The “OLd” message displayed beside the pH value means that
this buffer was not used during last calibration. Press 2nd then
SET key if you want to see calibration date (or time, if old
calibration was performed in the same day with current calibration).
• Each calibration buffer is displayed with the resolution from
calibration moment.
• If “no bUF” message appears on the LCD, the instrument informs
you that calibration was performed in less than five points.
• The Calibration Alarm Time Out status.
If disabled,
or the number of days until the calibration alarm will be displayed
(e.g. 5 days), or from the time calibration expired (e.g. –3 days).
• The instrument ID.