testo 252 Bedienungsanleitung Seite 92

With Puffer 1 + 2 : are pH 4.008;
pH 6.865 or pH 9.180 used?
yes
page 49
Measuring mode
Continue calibration
20
Automatic calibration with specified buffer solutions
no
CAL dAtA
Select the buffer solution required from those on
offer with the arrow keys and confirm with Enter
(a difference of 0.5 pH units must lie between the
individual buffers
automatically and thus only offers the relevant
buffers).
The instrument is calibrating, "CAL" flashes on the
screen (duration of calibration: min. 20 sec, max.10
min). A signal sounds the end of the calibration
procedure
If pH values other than the following DIN
buffers: pH 4.008; pH 6.865 and pH 9.180, were
used for previous calibrations, the instrument
automatically ends calibration and jumps to the
calibration data.
pH measurement
the instrument blocks this area