Tare the Instrument
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Choose an appropriate container in which to weigh the substance. Weighing boats, weighing paper, and small beakers typically make good containers.
Place the container in the center of the balance pan and wait for a stable reading.
A stable reading is one in which all but the last digit in the measurement remain constant. Fluctuation in the last digit is normal because the instrument is approaching the limits of its sensitivity.
When the reading has stabilized, press the Tare button. The mass of the container will be given a relative value of zero.