# Starting operation

- Keep the work area free from obstacles that could reflect or obstruct the laser beam. For example, cover any reflective or shiny surfaces. Do not measure through panes of glass or similar materials. The measurements may be distorted by a reflected or obstructed laser beam.

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1. Position the laser receiver so that the laser beam can reach the reception area (54).
2. Align it so that the laser beam runs straight through the reception area‌ (as shown in the figure).
3. For rotary lasers with multiple operating modes, select the horizontal or vertical operation with the highest rotational speed.

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- A loud audio signal may sound when switching on the laser receiver. Therefore, keep the laser receiver away from your ear or other persons when switching it on. The loud sound can damage hearing.

1. Press the button to switch on the laser receiver.
2. All display indicators and all LEDs light up briefly and an audio signal may sound.
3. To switch off the laser receiver, press and hold the button until all LEDs briefly light up and the display goes out.

With the exception of the setting for the display lighting, all settings are saved when the laser receiver is switched off.

If no button on the laser receiver is pressed for approx. 10 min and no laser beam reaches the reception area (54) for 10 min, then the laser receiver will automatically switch itself off to preserve battery life.

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When delivered, the rotary laser and the laser receiver supplied are already paired via Bluetooth®.

For the existing connection, the Bluetooth® connection indicator (k) appears in the display of the laser receiver.

1. To reconnect the laser receiver or to connect another laser receiver to the rotary laser, press and hold the button on the rotary laser until the symbol for establishing a connection to the remote control/laser receiver appears on the display of the rotary laser.
2. Then press and hold the and buttons on the laser receiver until P‑‑ appears in the text display (n) of the laser receiver.

Confirmation as to whether a connection has successfully been established will be shown on the display of the rotary laser. POK will appear in the text display (n) of the laser receiver.

If the connection between the rotary laser and the laser receiver cannot be established, PNK will appear in the text display (n) of the laser receiver and the error message for a failed connection will be shown in the display of the rotary laser. For troubleshooting, consult the operating instructions for the rotary laser.

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The position of the laser beam in the reception area (54) is shown in the display (58) on the front and back of the laser receiver by the direction indicator "Laser beam below centre line" (o), the direction indicator "Laser beam above centre line" (s) or the centre line display (q).

As an option, the position of the laser beam in the reception area can also be displayed as follows:

- By the red LED direction indicator "Laser beam below centre line" (57), the blue LED direction indicator "Laser beam above centre line" (55) and the green LED centre line (56) on the front of the laser receiver,
- by an audio signal.

On the first pass of the laser beam through the reception area (54) a short audio signal always sounds and the red "laser beam below centre line" LED direction indicator (57) and the blue "laser beam above centre line" LED direction indicator (55) briefly light up (even if the audio signal and/or LED direction indicators have been switched off).

Laser receiver too low: If the laser beam hits the upper half of the reception area (54), then the "laser beam above centre line" direction indicator (s) appears in the display.

If the LEDs are switched on, the blue "laser beam above centre line" LED direction indicator (55) lights up.
If the audio signal is switched on, a signal sounds at a slow rate.

1. Move the laser receiver upwards in the direction of the arrow.
2. When the laser beam is close to the centre line, only the tip of the "laser beam above centre line" direction indicator (s) is shown.

Laser receiver too high: If the laser beam hits the lower half of the reception area (54), then the "laser beam below centre line" direction indicator (o) appears in the display.

If the LEDs are switched on, the red "laser beam below centre line" LED direction indicator (57) lights up.
If the audio signal is switched on, a signal sounds at a fast rate.

1. Move the laser receiver downwards in the direction of the arrow.
2. When the laser beam is close to the centre line, only the tip of the "laser beam below centre line" direction indicator (o) is shown.

Laser receiver centred: If the laser beam hits the reception area (54) at the height of the centre line, then the centre line indicator (q) appears in the display.

If the LEDs are switched on, the green centre line LED (56) lights up.
If the audio signal is switched on, a continuous tone sounds.

Memory function of last reception: If the laser receiver is moved so that the laser beam leaves the reception area (54) again, the last displayed direction indicator for "laser beam above centre line" (s) or "laser beam below centre line" (o) flashes for a short time. This indicator can be switched on or off via the settings menu.

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If the laser beam hits the reception area (54), the clearance between the laser beam and the centre line of the laser receiver is shown in the text display (n) as an absolute value.

The unit of measurement for the height display can be changed in the settings menu ("mm" or "in").