Measurement; Taking Measurements; Millivolt (Mv) Reference Check; Holding A Reading - LaMotte pHPLUS DIRECT 2 Manual

5. To cancel or abort this operation, press the CAL key. To confi rm
the calibration, press the ENTER key. A new value will be
stored in the meter non-volatile memory. The DISPLAY will
display "CO" momentarily, and the meter will revert to the
measurement mode.

4. MEASUREMENT

4.1 Taking Measurements

1. Before measurement, rinse the pH/ORP probe or Ion Selective
Electrode and temperature probe with clean water to remove any
impurities.
2. Power on the meter using the ON/OFF key. Press the MODE
key to select the desired mode of operation (pH, mV, Ion, or
Temperature).
3. Dip the probes in the aqueous test sample. Stir gently with the
probes and wait for the reading to stabilize. Note the reading.
Freeze the displayed if desired—for details refer to Section 4.3

Holding a Reading.

4. Rinse the probes with clean water before taking the next reading
or storing the meter.

4.2 Millivolt (mV) Reference Check

The mV mode can be used for the diagnosis of an ISE or pH probe
condition. Press MODE to access the mV mode. The "mV" annunciator
will be displayed. The displayed value will show the absolute mV value
of the ISE or pH probe being measured.
4.3 Holding a Reading
To freeze or hold the displayed reading, press the HOLD key once. The
DISPLAY will display the "HO" annunciator to indicate the HOLD
function is activated.
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