Elo TouchSystems touch monitor - Manual (Page 22)

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Degauss
If you have moved the display unit, you should perform
demagnetization. Demagnetizing takes place automatically
when the display unit is switched on, and the unit normally
maintains faultless color purity during operation.
If you have tilted, swiveled or moved the display unit, you can
perform demagnetization. During the process the picture is
distorted for a few seconds. After demagnetization, the color
impurities have disappeared if caused by stray magnetic fields.
Do not use the degauss feature more than once every half hour
or the degauss function will not work.
Brightness Adjusts the brightness of the screen.
Contrast Adjusts the contrast of the screen.