Bosch GLM 100 C Operating/Safety Instructions Manual page 24

– The front measuring edge of tool (e.g. when measuring onward from a
table edge),
– The centre of measurement reference thread 19 (e.g. for measurement
made on a tripod).
To select the measurement reference, press button 10 until the requested
measurement reference is indicated on the display. Each time after
switching on the measuring tool, the rear edge of the measuring tool is
preset as the measurement reference.
Subsequent changing of the measurement reference for measurements
that have already been carried out (e.g. when indicating measuring values
in the measured-value list) is not possible.
To access the Basic settings/Func menu, press and hold the Func
button 8.
Briefly press the Func button 8 to select the individual menu items.
Press the minus button 5 or the plus button 11 to select the setting within
the menu items.
To exit the "Func" menu, press the measurement button 2.
Basic Settings
Tone signals
Display illumination
Digital vial
Tilt Display rotation
"Func" Menu
On
Off
On
Off
Auto on/off
On
Off
On
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