Hanna Instruments HI 3512 - Manual (Page 47)

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First point mode
Focus on the First Point Mode item.
Press the displayed function key in order to change the option.
First point mode refers to the behaviour of the instrument regarding
“One point calibration”.
The meter informations are displayed:
-firmware version
-language version
-mV/EC and temperature factory calibration time/date
pH CHANNEL RANGE SPECIFIC PARAMETERS SCREENS
Calibration Timeout
Focus on the Calibration Timeout item.
Press Modify.
Use ARROW keys to set desired value.
Press Accept to confirm or ESC to return without saving.
Note: If enabled “CAL DUE” warning will be displayed, the set number
of days calibration is past due.