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Calibration powder with a pH value of 4.00
With the calibration powder, the calibration liquid for pH measuring instruments can be produced without great effort.
To make the calibration liquid, simply dissolve the bag contents in 250 ml of distilled water. The water must not contain any other impurities.
Now hold the measuring electrode of the pH meter in the finished solution in order to calibrate the device to the appropriate value according to the instructions. Comply with the specifications of the device manufacturer.