# Starting Operation

- Protect the measuring tool from moisture and direct sunlight.

- Do not expose the measuring tool to any extreme temperatures or fluctuations in temperature. For example, do not leave it in a car for extended periods of time. If it has been subjected to significant fluctuations in temperature, first allow the measuring tool to adjust to the ambient temperature and then always carry out an accuracy check before continuing work see Accuracy Check of the Measuring Tool.
  The precision of the measuring tool may be compromised if exposed to extreme temperatures or fluctuations in temperature.

- Avoid substantial knocks to the measuring tool and avoid dropping it. Always carry out an accuracy check before continuing work if the measuring tool has been subjected to severe external influences see Accuracy Check of the Measuring Tool.

- Switch the measuring tool off when transporting it. The pendulum unit is locked when the tool is switched off, as it can otherwise be damaged by big movements.

## Switching On/Off

To switch on the measuring tool, slide the on/off switch (2) to the " On" position (for working with the pendulum lock) or to the " On" position (for working with automatic levelling). The status indicator (7) lights up. As soon as it is switched on, the measuring tool emits laser lines from the outlet apertures (1).

- Do not direct the laser beam at persons or animals and do not stare into the laser beam yourself (even from a distance).

To switch off the measuring tool, slide the on/off switch (2) to the "Off" position. The status indicator (7) goes out. The pendulum unit is locked when the tool is switched off.

- Never leave the measuring tool unattended when switched on, and ensure the measuring tool is switched off after use. Others may be blinded by the laser beam.

If the maximum permitted operating temperature of 50 °C is exceeded, the tool shuts down to protect the laser diode. Once it has cooled down, the measuring tool is operational again and can be switched back on.

## Automatic shut-off

If no button on the measuring tool is pressed for approx. 120 min, the measuring tool will automatically switch itself off to preserve battery life.

To switch the measuring tool back on after it has been automatically switched off, you can either slide the on/off switch (2) to the "Off" position first and then switch the measuring tool back on, or press either the vertical mode button (5) or the horizontal mode button (6) once.

To deactivate automatic shut-off, hold down the horizontal mode button (6) for at least three seconds (with the measuring tool switched on). If automatic shut-off is deactivated, the laser lines will flash briefly as confirmation.

Note: If the operating temperature exceeds 45 °C, automatic shut-off can no longer be deactivated.

To activate the automatic shut-off function, switch the measuring tool off and on again.