Hanna Instruments HI 98180 - Manual (Page 45)

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Press Modify.
Use ARROW key to select unit.
Press Accept to confirm selection or ESC to exit.
Note:• If the unit is changed or “User” is selected a warning message will
be displayed to alert that the ISE range must be calibrated.
• If a new probe was selected or custom probe parameter are changed,
the ISE range must be calibrated.