PeakTech 2801 Bedienungsanleitung Seite 35

6.3. Setting the reference level
The default setting for the reference level is the lower edge of
the instrument. Press the "Reference" button (4) to cycle through
the four reference settings.
Whenever you change the reference setting a beep sounds.
After restarting the device, the reference level automatically
returns to the default setting (lower edge).
Top Middle
Lower edge Angle piece
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