12
group. To abort the bu er group selection, press
CAL
to revert to the pH
measurement mode.
1. Press and hold
MODE
while switching the meter on using the
ON/OFF
key. The display will show
bUF
blinking.
2. Press the
ENTER
key to begin the bu er group selection mode.
Use the
MODE
key to toggle between USA, NIST or Pb as
shown below.
Press the
ENTER
key to con
Þ
rm the selection. The meter will
automatically revert to the pH measurement mode. The meter will save
the selected group inde
Þ
nitely until it is changed.
3.1.4 Resetting User Calibrated Values
The calibrated pH values can be reset to the factory default using the
procedure below. The temperature o set will not be reset using this
procedure. To abort the reset, press
CAL
to revert to the measurement
mode.
1. Press and hold
CAL
while switching the meter on using the
ON/
OFF
key. The DISPLAY will show
rSt
blinking.
2. Press the
ENTER
key to con
Þ
rm. The meter will automatically
clear all stored pH calibrations and revert to the measurement
mode.
3.2 Temperature Calibration
3.2.1 With Temperature Probe
The temperature probe supplied with the meter is factory calibrated. Over
time, the temperature calibration may drift and require recalibration. If
the temperature probe is replaced the meter should be recalibrated.
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