Bosch GLM100-23 Operating/Safety Instructions Manual page 18

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).
Also, air layers with varying temperatures or indirectly received
reflections can affect the measured value.
Accuracy Check of the Distance Measurement
For the accuracy check, the measurement should be taken
under favorable conditions, i.e. the measuring section should be
indoors and the target surface for the measurement should be
smooth and reflect well (e.g. a white-painted wall).
1. Select a measuring section of approx. 3 to 10 m long,
the length of which you know exactly (e.g. room width,
doorway).
2. Measure the section 10 times in succession.
– The deviation of the individual measurements from the
expected distance may be maximum ±2 mm throughout the
entire measuring section. Log the measurements, so that you
can compare their accuracy at a later point of time.
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