PH400 Portable pH Meter — Set to Factory Default
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Turn on the meter Hold on the “Mode/Setup” button until “P1” comes up on the display. Press “Enter” button (you will see P1.1) Then press “downward” button (you will see P1.2) Press “Enter” again (you will see “no” flashing) Press “downward” button to change “no” to “yes” Press enter again to confirm the change. (the meter has been set back to factory default mode). The meter goes back to measurement mode automatically Conduct pH calibration again afterwards

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