Bosch Professional GLM 50-23 G - Accuracy Checks and Accessories; Checking Measurement Accuracy; Using Tripod and Belt Clip

28 | English
Checking accuracy and calibrating the grade measurement (see figureL)
Regularly check the accuracy of the grade measurement. This is accomplished by means
of a reverse measurement. To do this, lay the measuring tool on a table and measure the
inclination. Turn the measuring tool by 180° and measure the inclination again. The dif-
ference between the displayed values must not exceed 0.3°.
In the event of larger deviations, you have to recalibrate the measuring tool. To do so, se-
lect in the settings. Follow the instructions on the display.
We recommend that you perform an accuracy check and if necessary a calibration of the
measuring tool after extreme temperature variations and after impact to the tool. After a
temperature variation, the measuring tool must adjust to the ambient temperature for a
while before calibration is performed.
Accuracy Check of the Distance Measurement
You can check the accuracy of the measuring tool as follows:
– Choose a measuring section of approx. 3–10 m in length that is permanently un-
changed, the exact length of which is known to you (e.g. room width, door opening).
The measurement should be taken under favourable conditions, i.e. the measuring
section should be indoors and the target surface for the measurement should be
smooth and reflect well.
– Measure the section ten times in succession.
The deviation of the individual measurements from the mean value must not exceed
±4mm over the entire measuring section in favourable conditions. Record the measure-
ments in order to be able to compare the accuracy at a later date.
Working with the tripod (accessory)
The use of a tripod is particularly necessary for larger distances. Place the measuring tool
with the 1/4" thread (14) on the quick-release plate of the tripod (21) or of a commer-
cially available camera tripod. Tighten it using the locking screw of the quick-release
plate.
Set the reference level for measurements with a tripod in the settings (see "Selecting the
reference level (see figureA)", page19).
Belt clip (accessory) (see figureM)
With the belt clip (17), the measuring tool can be conveniently secured to your belt.
Error message
If a measurement cannot be performed correctly, the “Error” message will appear in the
display. Start the measurement again.
1 609 92A 62A | (21.12.2020) Bosch Power Tools