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— Set up the measuring tool on the other side
of the door opening, directly behind point II.
Allow the measuring tool to level in and align
the vertical laser line in such a way that its
center passes through points I and II exactly.
— Mark the center of the laser line on the upper
edge of the door opening as point IV.
— The discrepancy d between the two marked
points III and IV reveals the actual vertical de-
viation of the measuring tool.
— Measure the height of the door opening.
Always use the center of the laser line for
marking. The width of the laser line changes
with the distance.
Attaching Using the Magnetic Rotat-
ing Mount (see figures C and D)
You can secure the measuring tool to magneti-
sable materials using the integrated magnetic
rotating mount 4.
Keep your fingers away from
the rear side of the magnet-
ic rotating mount while attaching the rotating
mount to surfaces. The strong pulling force of
the magnets 6 may jam your fingers.
Roughly align the magnetic rotating mount 4 be-
fore switching on the measuring tool.
Rotate the measuring tool on the magnetic ro-
tating mount 4 to make the bottom laser point
visible or to project heights with the horizontal
laser point. If you switch off and transport the
measuring tool, click it back into place on the
rotating mount (see figure D).
160992A8JG GLL50-20 G 202306.indd 15
Operation
You can calculate the maximum permitted devia-
tion as follows:
GLL50-20:
Doubled height of the door opening × 0.0098 in/
ft (0.8 mm/m)
Example: At a door opening height of 6.5 ft (2
m), the maximum deviation amounts to 2 × 6.5
ft × ±0.0098 in/ft = 0.13 in (2 × 2 m × ±0.8 mm/m
= ±3.2 mm). The points III and IV must therefore
be no further than 0.13 in (3.2 mm) from each
other.
GLL50-20G:
Doubled height of the door opening × 0.0078 in/
ft (0.7 mm/m)
Example: At a door opening height of 6.5 ft (2
m), the maximum deviation amounts to 2 × 6.5
ft × ±0.0078 in/ft = 0.10 in (2 × 2 m × ±0.7 mm/m
= ±2.8 mm). The points III and IV must therefore
be no further than 2.8 mm from each other.
Working Advice
Working with a Tripod (Accessory)
A tripod 18 offers a stable, height-adjustable
measuring support. Place the tool via the tripod
mount 1 onto the 1/4-20 male thread of the tri-
pod and screw the locking screw of the tripod
tight.
Laser Viewing Glasses (Accessory)
The laser viewing glasses 17 filter out the ambi-
ent light. This makes the light of the laser ap-
pear brighter to the eyes.
The laser viewing glasses are used for improved
visualization of the laser beam, but they do not
protect against laser radiation.
traffic. The laser viewing glasses do not provide
complete UV protection and reduce color per-
ception.
Do not use the laser viewing
glasses as safety goggles.
Do not use the laser viewing
glasses as sunglasses or in
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