Bosch GLL 50 Operating/Safety Instructions Manual page 30

Laser Viewing Glasses (Accessory)
The laser viewing glasses filter out the ambient light. This makes the
red light of the laser appear brighter to the eyes.
Work Examples (see figures B2–F2, H and I)
Application examples for the measuring tool can be found on the
graphics pages.
Always position the measuring tool close to the surface or edge you
want to check, and allow it to level in prior to each measurement.
Always measure the distances between the laser beam and a surface
or edge at two points as far as possible away from each other.
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