Bosch GLM400CL Operating/Safety Instructions Manual page 39

Accuracy Check of the Distance Measurement
The accuracy of the measuring tool can be checked as follows:
– Select a permanently unchangeable measuring section
– Measure the distance 10 times in succession.
The deviation of the individual measurements from the
average value must not exceed ±.07 in (±2 mm) over the
entire measuring section in favorable conditions. Record the
measurements in order to be able to compare the accuracy
at a later date.
Checking Accuracy and Calibrating the Target Indicator
(Crosshair)
Check the accuracy of the alignment of the laser and target
indicator on a regular basis.
– Select a bright area at least 10 m away with as little
– Check whether the laser point is inside the target indicator
If the laser point is not inside the target indicator, you must
recalibrate the target indicator. To do so, select
settings. Follow the instructions on the display.
Working with the Tripod (Accessory)
The use of a tripod is particularly necessary for larger distances.
Position the measuring tool with the 1/4" thread 17 onto the
quick-change plate of the tripod 27 or a commercially available
camera tripod. Tighten the measuring tool with the locking
screw of the quick-change plate.
Set the reference level for measurements with a tripod in the
basic settings (thread reference level).
1.800.561.8187
which is approx. 9.8 to 32 ft (3 to 10 m) long and which you
know the exact length of (e.g. room width, door opening).
The measurement should be performed under favorable
conditions, i.e. the measuring section should be indoors with
weak backlighting and the target area of the measurement
should be smooth and reflect well (e.g. a white-painted wall).
illumination as possible as the target.
in the display.
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