Hanna Instruments HI 221 - Manual (Page 16)

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_ The date (mm.dd).
_ The year (yyyy).
_ The pH calibration offset.
_ The pH calibration slope in mV/pH normalized to 25 °C.
Note: If you calibrate using electrodes with pin the electrode condition and re-
sponse gauges appear while the offset and slope are displayed.
_ The first pH calibration buffer along with any warning messages issued
while calibrating at this point.
_ The second pH calibration buffer along with any warning messages issued
while calibrating at this point.
Note: If the last calibration was a single point calibration, the message for
the second buffer will be: “no bUFF”.