Hanna Instruments HI 2221 - Manual (Page 20)

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• If “no bUF” message appears on the LCD, the instrument informs
you that the calibration was performed with less than five buffers.
• Calibration Expiration status:
- if disabled.
- or the number of days until the calibration alarm will be displayed,
- or if expired (7 days ago).
• The instrument ID.
Notes: • Press GLP to return to measurement mode.
• If calibration has not been performed, the instruments
display “no CAL” message blinking.