Bosch GLM400CL Operating/Safety Instructions Manual page 38

Influence Effects on the Measuring Result
Due to physical effects, faulty measurements cannot be
excluded when measuring on different surfaces. Included here
are:
– Transparent surfaces (e.g., glass, water),
– Reflecting surfaces (e.g., polished metal, glass),
– Porous surfaces (e.g. insulation materials),
– Structured surfaces (e.g., roughcast, natural stone).
If required, use the laser target plate 25 (accessory) on these
surfaces.
Furthermore, faulty measurements are also possible when
sighting inclined target surfaces.
Also, air layers with varying temperatures or indirectly received
reflections can affect the measured value.
Accuracy Check and Calibration of the Grade Measurement
(see figure H)
Regularly check the accuracy of the grade measurement. This
is done by carrying out a reversal measurement. For this, place
the measuring tool on a table and measure the grade.
Turn the measuring tool by 180° and measure the grade again.
The difference of the indicated reading may not exceed by
more than 0.3° (max.).
In the event of larger deviations, you have to recalibrate the
measuring tool. For this, select . Follow the instructions on
CAL
the display.
After severe temperature changes and impact, we recommend
an accuracy check and, if required, to recalibrate the measuring
tool. After a temperature change, the measuring tool must
acclimate for a while before calibrating.
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