Ironside IRL892 Mode D'emploi page 14

Vertical Calibration Test
1. Hang a plumb line from a high point on a wall.
2. Place the laser on a flat, vibration free surface about 3ft
(1m) from the wall.
3. Press the Beam Selector button until the vertical beam is
projected.
4. Adjust the laser so that it touches the bottom of the plumb
line.
If the laser line is touching the plumb line at the top the
laser is calibrated.
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