How to use the calibration square

• Remove the square from the case and open it to a 90° angle.

• Slide the locking bar as far as the screw stops and tighten the 3 screws.

• To turn on the square, turn it over and push the switch. The indicator light comes on.

• Place the square on the floor and arrange it in such a way as to determine the orientation of your X and Z axes.

*To change the battery, turn the square over to access the electrical box. Push the cover of the box outwards and replace the 9 volt battery.