LaMotte 5 Series pH Meter - Manual (Page 15)

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4. MEASUREMENT
4.1 Taking Measurements
1. Before measurement, rinse the pH probe 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 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 4.2
Holding a Reading.
4. Rinse the probes with clean water before taking the next reading
or storing the meter.
4.2 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.
4.3 Releasing a Held Reading
Press the HOLD key once again to deactivate the HOLD function
or to release the frozen reading. The meter will revert to the current
measurement mode, and the “HO” annunciator will disappear from the
DISPLAY.