NAVI D-25 Instruction Manual page 40

D-52/53/54/55
2.
Press the CAL key to start calibration.
The measured value will be displayed, and
"HOLD" will blink until the reading stabilizes.
When the value stabilizes, "HOLD" will stop
blinking and the calibrated value will be displayed.
The bottle mark will be displayed, indicating that
calibration was conducted with pH7 standard
solution
To stop the calibration:
Press the CAL key while the HOLD mark is blinking.
To establish the calibration:
Press the ENTER key while the HOLD mark is blinking.
To redo the calibration:
Press the CAL key after the HOLD mark is displayed.
2 Taking Measurements
2.5 Measuring pH
29