Bosch GLM 15 Consignes D'utilisation/De Sécurité page 13

When no button on the measuring tool is pressed for approx. 5
minutes, the measuring tool automatically switches off to save the
batteries.
"Err" occurs when trying to hold a measurement
that is out of range or measurement cannot be
read correctly by tool.
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.
Switch off the measuring tool. Press the measuring button 1
and hold it down. The display will alternately show both units
of measure. When the desired setting is displayed, release the
measuring button 1. The setting is saved.
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.
Press the "HOLD" button 1 once more to
stop the measuring procedure again. The
laser beam is switched off and the HOLD
indication appears on the display. The
previous measuring value is displayed in
the top line. The current measuring value is
displayed in the bottom line, but is no longer
continuously updated.
Working Advice
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