When preparing for any kind ofcalibrationorAdjustment, you need to be aware of the following:

• choose correctpH buffers并检查他们的过期不过期

• examine thepH electrodefor visible signs of damage

• register the buffers and pH-meter, e.g. in a logbook

• pour the buffers into containers

• make sure the equipment you will use have approximately thesame temperature