LW Measurements LWC 800 - Manual (Page 18)

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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 your
sales representative.
3.6 When to calibrate the weighing machine
Calibration is done in the factory. Don’t re-calibrate the machine unless it is
not accurate. If you do need to calibrate the machine, refer to Section 5
–
Calibration.
4 Working with the application menus using the
Key-Pad
4.1 Display messages and key functions
4.1.1 Display messages:
Low battery indicator
Negative value indicator
Zero indicator