LW Measurements KHR 502 - Manual (Page 17)

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To summarize:

Put the weighing machine on a solid, firm and preferably vibration-
proof, horizontal base

Make sure that the weighing machine cannot be shaken or
knocked over

Protect from direct solar radiation

Avoid drafts and excessive temperature fluctuations
3.7 Checking the mains voltage
The following Safety recommendations must be observed when connecting
the balance to the mains:
The machine may only be operated with the power adapter supplied.
Check before connecting the power adapter to the mains supply, that the
operating voltage stated on the power adapter agrees with the local mains
voltage.
If the operating voltage is not the same as the mains voltage, the power
adapter must, on no account, be connected to the mains supply. Contact
customer service.
3.8 Calibrating the weighing machine
Since the Earth’s gravity is not the same everywhere, each balance 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 must be carried out at 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), as with time and use, mechanical deviations may occur.