User Manual

Establishing Elevation Control Hubs
The elevation control hub can be used to re-establish the elevation of the
laser plane in case the laser setup gets disturbed.
1. Establish an elevation-control hub close to the laser and determine the HI.
Note: If you’re also going to establish a grade control hub, make sure the
elevation-control hub and grade -control hubs are on the same axis.
Establishing Grade Control Hubs
The slope control hub can be used to check the alignment of the laser on the
job site and to confirm the grade entered into the laser.
1. Check the grade on a minimum of three hubs on the job site. The hubs
should be in lines that are 90° from one another with one line containing
two hubs.
Note: Because the accuracy of this procedure is based on the known
elevation of the hubs, the exact elevation of the hubs is critical.
Note: If there isn’t enough space for the laser to be setup on the desired
centerline, the laser can be set up on a line parallel to the centerline (D1-D2).