Kapro PROLASER ELECTROTA 8991 Manuel D'utilisation page 20

The Rotary Laser leaves the factory fully calibrated. Kapro
recommends that the level be checked regularly and especially
after the unit has been dropped or mishandled.
Horizontal Plane Calibration Test
1. Set up the Rotary Laser approximately 50m (165ft) from a wall
or measuring staff.
2. Position the Rotary Laser so that the X-axis is pointing in the
direction of the measuring staff or wall.
3. Turn on the Rotary Laser.
4. Mark the height of the laser beam on the wall or measuring
staff (h1).
5. Rotate the Rotary Laser 180°.
6. Mark the height of the laser beam on the wall or measuring
staff (h2). The difference between the heights should not
exceed 10mm (3/8 inch).
7. Repeat the procedure for the Y-axis.
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FIELD CALIBRATION TEST