Hanna Instruments HI 121 - Manual (Page 26)

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• The pH calibration offset.
• 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, with the corresponding
warnings.
The first pH calibration buffer:
The second pH calibration buffer:
The third pH calibration buffer: