User Manual

Calibration
As with any precision instrument, the calibration needs checking on a regular
basis (such as the beginning of each job, or if the laser has been handled
roughly). If the laser is to be used below freezing, be sure to check
calibration under those conditions.
The laser has a calibration error when the laser plane coming out one side of
the laser is above true level, and the laser plane coming out the opposite side
is below true level. Adjusting the position of the laser plane requires making
minor adjustments the leveling mechanism using the up and down buttons on
the control panel.
When the laser is properly calibrated, it emits a 360° horizontal level plane so
that if the laser is turned 180° or 90° from its original position, the reading is
within ±5/16 in. per 300 ft (±8 mm/90 m) of the original position.
To check the horizontal calibration, you’ll need a tripod with a 5/8-11
threaded mount and a hand-held receiver. If you need to adjust the
calibration, having another person to help saves time.
Checking Calibration
1. Set up the laser 300 ft (90 m) from a wall.
2. Set the grade to 0.000% in both axes.
3. Raise/lower the receiver until you get an on-grade reading for the +∠
axis. Using the on-grade marking notch as a reference, make a mark on
the wall.
Note: For increased precision, use the fine-sensitivity setting (+1/16 in./+1.6
mm) on the receiver.
4. Rotate the laser 180° (–∠ axis toward the wall) and allow the laser to re-
level.
5. Raise/lower the receiver until you get an on-grade reading for the –∠
axis. Using the on-grade marking notch as a reference, make a mark on
the wall.
6. Measure the difference between the two marks. If they differ more than
5/16 in. (8 mm), the laser needs calibrating.
Adjusting the Calibration at the Laser