Bosch GLM 100 C Operating/Safety Instructions Manual page 35

measure the angle again. The difference of the indicated reading may not
exceed 0.3 ° (max.).
In case of greater deviation, the measuring tool must be recalibrated. For
this, press and hold the angle measurement button 3. Follow the directions
on the display.
Accuracy Check of the Distance Measurement
The accuracy of the distance measurement can be checked as follows:
– Select a permanent measuring section with a length of approx. 3 ft to 33
ft; its length must be precisely known (e.g. the width of a room or a door
opening). The measuring distance must be indoors; the target surface
for the measurement must be smooth and reflect well.
– Measure the distance 10 times after another.
The deviation of the individual measurements from the mean value must not
exceed ±1/16" (max.). Log the measurements, so that you can compare
their accuracy at a later point of time.
The use of a tripod is particularly necessary for longer distances. Position
the measuring tool with the 1/4"-20 thread 19 onto the quick-change plate
of the tripod 28 or a commercially available compact tripod. Tighten the
measuring tool with the locking screw of the quick-change plate.
Set the corresponding measurement reference for measurement with a
tripod by pushing button 10 (the measurement reference is the thread).
Working with the Digital Level Attachment
The measuring rail 26 can be used for a more accurate angle measurement
result. Distance measurements are not possible with the measuring rail.
Other modes are disabled once the rail is detected.
levels of the measuring rail.
Working with the Tripod (Accessory)
(see figures I–K)
Place the measuring tool into the measuring rail 26 as
shown and lock the measuring tool with locking lever 27.
Press the measuring button 2 to activate the "Measuring
rail" operating mode.
Regularly check the accuracy of the angle measurement
by carrying out a reversal measurement or with the spirit
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