Bosch GCL 2-160 Operating/Safety Instructions Manual page 30

Working with the Laser Target Plate (see figure H)
The laser target plate 25 increases the visibility of the laser beam
under unfavourable conditions and at large distances.
The reflective part of the laser target plate 25 improves the visibility
of the laser line. Thanks to the transparent strip, the laser line is also
visible from the back side of the laser target plate.
Laser Viewing Glasses (Accessory)
The laser viewing glasses filter out the ambient light. This makes the
red light of the laser appear brighter for 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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