Hanna Instruments HI 98188 - Manual (Page 14)

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The EC, Resistivity and TDS scales are autoranging. The meter automatically
sets the scale with the highest possible resolution.
By pressing Lock, the autoranging feature is disabled and the current range is
frozen on the LCD.
The “Range: Locked” message is displayed. To restore the autoranging
option press “AutoRng” functional key again.
The autoranging mode is also disabled by selecting a “fixed range” in the
Setup menu. While in fixed range mode the instrument will display the
readings with the fixed resolution. Maximum 6 digits can be displayed. The
top of the fixed range is displayed blinking when the reading exceeds this
value.
To disable fixed range mode enter Setup and select autoranging mode.
Note: Autoranging is automatically restored if the range is changed, if the
calibration mode is entered, or if the meter is turned off and back on
again.
AUTORANGING AUTORANGING AUTORANGING AUTORANGING AUTORANGING