be in calibration solution of 7.00 pH, then followed by 2nd or 3rd point
calibration. For details, please refer to the following table:
b) Automatic self-diagnostic information: if measured value is more than preset
range, LCD will display “Er1”; In calibration mode, if the measured value
hasn`t been stable, i.e. has not been displayed on LCD, pressing
will cause LCD to display “Er2”.
5. Measurement
5.1 Short press to turn on the tester. Rinse probe in pure water and dry it.
5.2 Stir probe in sample solution gently, leave it to stand. Get readings after
comes up and stays.
■ Special Notes
After each use, users should rinse the pH probe thoroughly.
For the premixed pH calibration buffer solutions, we recommend replacing
them after 10 to 15 times of use to keep its accuracy.
The instruments will NOT give accurate and stable pH readings when
testing distilled or deionized water. This because distilled and deionized
water do not have enough ions present for the electrode to function
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