Bosch GLM100-23 Operating/Safety Instructions Manual page 17

Changing the Unit of Measure
The unit of measure can be changed any time for display of
the measured value, even for already measured or calculated
values.
Press the Rounding button 9 and hold it down for >1 sec. The
display will open a "Click wheel" showing all units of measure
available (in., ft., metric, etc.). To toggle through the units
press the Rounding button 9. When the desired setting is
displayed, press the measuring button 1. The setting is saved
and previous measurements are calculated accordingly.
Working Advice
General Information
The reception lens 7 and the laser beam outlet 8 must not be
covered when taking a measurement.
Measurement takes place at the center of the laser beam, even
when target surfaces are at a slope.
Influence Effects on the Measuring Range
The measuring range depends on the light conditions and the
reflection properties of the target surface.
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