Sper Scientific 850061 pH SD Card Datalogger Kit - Manual (Page 19)

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CALIBRATION
This meter has been calibrated using
a pH probe with an ideal reading:
generates 0 mV at pH 7.00 (177.4
mV at pH 4) in an ambient
temperature of 25°C. Because your
probe may not be ideal, calibration is
necessary before first time use. For
best results, calibrate your meter
weekly. For the highest accuracy, we
recommend a two point calibration.
Begin with pH 7 (then calibrate pH 4
or 10).
To calibrate:
1. Prepare the probe for calibration
(see page 25).
2. Using a standard pH and/or ATC
probe, plug the probe plug into the
pH probe socket.
3. Press POWER to turn the meter
on.
4. For the standard pH probe only
(not ATC): Adjust the manual
temperature compensation value