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All Hanna bench-top pH meters have been
factory calibrated for the temperature and mV
and is ready for measurements.
The temperature probes and ORP electrodes
are interchangeable and no temperature or
mV calibration is needed when the tempera-
ture probe or the ORP electrode is replaced.
If, for any reason, the temperature or the mV
measurements are out of accuracy, the tem-
perature or the mV re-calibration should be
carried out.
In any case, we recommend that you have
your bench-top meters re-calibrated in tem-
perature and mV once a year.
In  HI 931402 it is possible to calibrate the
meter for temperature and mV (see page 29),
however it is recommendable that these cali-
brations are performed by technical personnel
only.
For an accurate recalibration, contact your
nearest Hanna Service Center.
TEMPERATURE AND mV CALIBRATION