©2010 Johnson Level & Tool - Rev. 1 13
Note: Take the batteries out when the unit is not in use for a
long time.
4. Detecting Methods
1. This unit can detect a red rotating laser beam.
2. Press the Power Key once , the middle signal indicator will
quickly turn red first and then turns green. It will beep once
to indicate that the instrument is ON.
While detecting, the signal indicators show as follows:
Note:
1. While detecting a horizontal laser beam, it is necessary to
have the horizontal bubble vial centered, as the tilt of the
detector will influence its receiving accuracy.
The lower red
LED is on
Sound: Single short
sound
Laser Line
Laser Line
Laser Line
Laser Line
The upper red
LED is on
The middle LED
is orange
The middle LED
is green
All LEDs
are off
Sound: Single short
sound
Sound: Single short
sound
Sound: Solid sound Sound:
No Sound
The laser beam is
up
The laser beam is
down
The laser beam is close
to center
The laser beam is
exactly to center
No laser
beam is
detected
3919H_Manuals 10/12/10 10:31 AM Page 13
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