PH buffers are solutions of a known and fixed PH which are used to calibrate
meters and should be done on a regular basis to ensure ongoing accuracy from
the meter.
Pour out a small amount to use for calibration and then discard solution when
finished, do not pour back into container.
Use PH buffer 7 to calibrate meter to neutral and then use PH buffer 4 to calibrate
the correct acidic level for meter.
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