Preparing the pH buffer solution
1. Open the pH7.00 buffer sachet, place the reagent into a 250ml volumetric flask.
2. Fill the volumetric flask to the mark with distilled water, mix the solution until the reagent is completely dissolved.
3. Preparation of pH4.01 and 10.01 buffer solutions are the same as above. Prepared standard buffer solutions should be
stored in hermetically sealed glass containers.
pH Calibration
The METRIA M21 pH meter allows 1 to 3 points calibration in the pH mode. We recommend that you perform at least 2 points
calibration for high accuracy measurement. The meter will automatically recognize and calibrate to following standard buffer
values.
Single point calibration should only be carried out with pH7.00 or 6.86, otherwise calibration will not be accepted.
Make sure to calibrate the meter when attaching a new electrode. Do not reuse the calibration solution after calibration,
contaminants in solution will affect the calibration and eventually the accuracy of the measurement.
In order to get accurate measuring results, we recommend using a stirrer to create the homogeneous buffer solutions and sample.
Setting the number of calibration points
1. Press and hold the key for 3 seconds to enter the setup menu.
2. Press the Enter key, the display shows .
3. Press the / key to select 1 or 2 or 3 points calibration, press the Enter key until the meter returns to the measurement
mode.
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