29 GB
Manual calibration
Clean the electrode probe
1
and the test liquid
absorption rod
1a
(see “Cleaning the electrode probe
and the test liquid absorption rod”).
Switch the product off and then on again (see “Power
on/off”). pH
7
is shown in the display.
Press
/MODE
5
twice to enter the calibration
mode. CAL is flashing in the display
6
.
Press CAL/HOLD
4
repeatedly until the required
pH value (4.01 pH, 6.86 pH or 9.18 pH) is flashing
in the display
6
(between the MIN
2
and MAX
3
markings).