Hanna Instruments HI 255 - Manual (Page 20)

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• The pH calibration slope(the GLP slope is the average of the calibration
slopes; the percentage is referred to the ideal value of 59.16 mV/pH).
• The calibration buffers in calibrating order.
The first pH calibration buffer:
The second pH calibration buffer:
The third pH calibration buffer:
Note: • The “OLd” message displayed beside the pH value means that this
buffer was not used during last calibration. Press and hold down
the ALT&SET keys if you want to see calibration date (or time if old
calibration was made in the same day with current calibration).
• If “no bUF” message appears on the LCD, the instrument informs
you that calibration was performed in less than three points.
• Temperature compensation mode (Atc or Mtc; with or without temperature
probe).
• pH resolution during calibration:
BUF
pH CAL
BUF
pH CAL
BUF
CAL
BUF
pH CAL
% CAL
CAL
CAL