Basic Settings Menu
In the Basic settings menu, you can find the following basic settings:
Switching on and off Bluetooth®
Changing the reference level see Selecting the Reference Level
Timer
Switching on and off permanent laser beam
Grade measurement calibration see Accuracy Check
Target display calibration
Setting the language
Setting Date & Time
Changing the unit of measurement
Changing the Unit of Measurement of an Angle
Activating PRO360
Calling up Device Information
Switching audio signals on and off
Adjusting the Cut-Off Time
Adjusting the Dimming Time
Setting display brightness
Switching automatic screen rotation on and off
- Briefly press the
button or press and hold the
button to open the Basic settings
menu.
- Use the
button or
button to select the required setting.
- To confirm a selection, press the
button.
- To exit the Basic settings
menu, press the
button or the
button.
Switching On and Off Bluetooth®
- Briefly press the
button or press and hold the
button to open the Basic settings
menu.
- Select
.
- To change the selection, press the
button or the
button.
- To confirm the selection, press the
button.
- To exit the Basic settings
menu, press the
button or the
button.
Timer 
The timer function helps, for instance, with measuring at difficult-to-access points, or should measuring tool movements be prevented during the measurement.
- Briefly press the
button or press and hold the
button to open the Basic settings
menu.
- Select
.
- Select the required time span from release to measurement and confirm with the
button or the
button.
- Press the
button to switch on the laser beam and aim for the target point.
- Press the
button again to start the measurement.
- Measurement follows after the selected time span. The measured value is displayed in the result line (a). The time span from release to measurement is displayed in the status bar at the top.
Continuous measurement and minimum/maximum measurement are not possible when the timer function is set. The timer stays set until the measuring tool is switched off or until the timer is switched off in the "Settings" menu.
Permanent Laser Beam
The laser beam can be set to be permanently switched on.In this setting, the laser beam also remains switched on between measurements. Just a single brief press of the button is necessary for measuring.
- Briefly press the
button or press and hold the
button to open the Basic settings
menu.
- Select
.
- To change the selection, press the
button or the
button.
- To confirm the selection, press the
button.
- To exit the Basic settings
menu, press the
button or the
button.
The continuous laser beam can be switched off again in the settings or automatically when the measuring tool is switched off.
Setting the Language 
- Briefly press the
button or press and hold the
button to open the Basic settings
menu.
- Select the Tool settings
menu.
- Select
and confirm the selection with the
button.
- To change the selection, press the
button or the
button.
- To confirm the selection, press the
button.
- To exit the Basic settings
menu, press the
button or the
soft button.
Date & time 
- Briefly press the
button or press and hold the
button to open the Basic settings
menu.
- Select the Tool settings menu
.
- Select
.
- Set the date and time according to the instructions on the display and confirm with the
button.
- To exit the Basic settings
menu, press the
button or the
button.
Changing the Unit of Measurement
The default unit of measurement is "m" (metres).
- Briefly press the
button or press and hold the
button to open the Basic settings
menu.
- Select the Tool settings
menu.
- Select
.
- To change the selection, press the
button or the
button.
- To confirm a selection, press the
button.
- To exit the Basic settings
menu, press the
button or the
button.
The selected device setting remains saved after you switch off the measuring tool.
Changing the Unit of Measurement of an Angle 
Basic setting is the angle unit "°" (degrees).
- Briefly press the
button or press and hold the
button to open the Basic settings
menu.
- Select the Tool settings
menu.
- Select
.
- To change the selection, press the
button or the
button.
- To confirm the selection, press the
button.
- To exit the Basic settings
menu, press the
button or the
button.
The selected device setting remains saved after you switch off the measuring tool.
PRO360 
Initial activation is required. Data can only be transferred using a suitable app or computer program. PRO360 can be deactivated again at any time.
GLM 100-25 C: After changing the battery, the measuring tool must be switched on once to restart PRO360.
You can find additional information about PRO360 at www.pro360.com.
- Briefly press the
button or press and hold the
button to open the Basic settings
menu.
- Select the Tool settings
menu.
- Select
.
- To change the selection, press the
button or the
button.
- To confirm a selection, press the
button.
- To exit the Basic settings
menu, press the
button or the
button.
Device Information 
Here you will find information about the measuring tool, such as the serial number, software version and licences.
- Briefly press the
button or press and hold the
button to open the Basic settings
menu.
- Select the Tool settings
menu.
- Select
.
- To exit the Basic settings
menu, press the
button or the
button.
Switching audio signals on and off
- Briefly press the
button or press and hold the
button to open the Basic settings
menu.
- Select the Tool settings
menu.
- Select
.
- To change the selection, press the
button or the
button.
- To confirm a selection, press the
button.
- To exit the Basic settings
menu, press the
button or the
button.
Adjusting the Cut-Off Time 
The automatic cut-off time is adjustable: 2, 5, 10 minutes or never.
- Briefly press the
button or press and hold the
button to open the Basic settings
menu.
- Select the Tool settings
menu.
- Select
.
- To change the selection, press the
button or the
button.
- To confirm the selection, press the
button.
- To exit the Basic settings
menu, press the
button or the
button.
Adjusting the Dimming Time
The display illumination is continuously switched on. If no button is pressed, the display lighting is dimmed after approx. 30 seconds to preserve the rechargeable battery. The time until the start of dimming is adjustable.
- Briefly press the
button or press and hold the
button to open the Basic settings
menu.
- Select the Tool settings
menu.
- Select
.
- To change the selection, press the
button or the
button.
- To confirm the selection, press the
button.
- To exit the Basic settings
menu, press the
button or the
button.
Setting Display Brightness
The brightness of the display can be adjusted to the environmental conditions with several settings.
- Briefly press the
button or press and hold the
button to open the Basic settings
menu.
- Select the Tool settings
menu.
- Select
.
- To change the selection, press the
button or the
button.
- To confirm the selection, press the
button.
- To exit the Basic settings
menu, press the
button or the
button.
Switching Automatic Screen Rotation On and Off 
When automatic screen rotation is switched on, the display on the screen rotates automatically when you turn the measuring tool.
- Briefly press the
button or press and hold the
button to open the Basic settings
menu.
- Select the Tool settings
menu.
- Select
.
- To change the selection, press the
button or the
button.
- To confirm the selection, press the
button.
- To exit the Basic settings
menu, press the
button or the
button.