ViewSonic PJ-vTouch-10S User Manual page 14

6.2 Red Laser flatness calibration steps:
6.2.1 Adjust Gear B; make the distance between the two points b / c in the
image below and the whiteboard parallel.
6.2.2 Adjust Gear A, check and make sure that the distance between the
two points b / c and the whiteboard is 6±1.5mm.
6.2.3 Check and make sure that the distance between the three points a /
b / c and the whiteboard is approximately 6±1.5mm.
6.2.4 Calibration complete; press the red laser switch to turn off the red
laser.
b
a
6
c