Hanna Instruments HI 98188 Instruction Manual page 46

Press the displayed functional key in order to change option.
If enabled, the "Out Cal Range" message will be displayed if the EC reading
is not within the calibration range.
Temperature Coefficient
Focus on the Temperature Coefficient item.
Press Modify in order to set the temperature coefficient.
Use the Arrow keys to change the value.
Press Accept to confirm or ESC to exit without changing.
Temperature Reference
Focus on the Temperature Reference item.
Press the corresponding functional key to select the desired reference temperature.
Temperature unit
Focus on the Temperature unit item.
Press the displayed functional key in order to change the temperature unit.
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