Hanna Instruments HI 3512 - Manual (Page 50)

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Focus on Charge/Slope item.
Use ARROW keys in order to select the desired combination.
If “ None/-59.16“ is selected the slope of the probe can be changed by
pressing Modify key.
Press Modify.
Use ARROW keys to change the slope.
Press Accept to confirm or ESC to exit.
Focus on Molar Weight.
Press Modify in order to change molar weight.
Use ARROW keys to change the value. Press Accept to confirm or ESC to
exit.