LW Measurements MCT 66 - Manual (Page 18)

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measurements, the machine must again be carefully leveled after each
relocation.
Fig. 1 Correct leveling with the aid of the bubble level and adjusting feet.
3.7 Calibration of the weighing machine
Since the Earth’s gravity is not the same everywhere, each weighing machine
must be adjusted to compensate for the gravity differences at each location in
accordance with the underlying physical weighing principles. This adjustment
process, known as calibration and must be carried out on initial installation and
after each subsequent relocation.
In order to ensure exact measurements, it is recommended that the balance
should be calibrated regularly using a known external calibration weight (see
Section 5 below).