Click this icon for an explanation of Target-Background
Contrast.
Click to return to screen 1A.3.
To reselect the target, click this button and re-
execute steps 3-5;
To recalibrate, click this button and re-execute
steps 1-5.
Note: If the material is changed after last setup, you need to
recalibrate the background and reset the target for the current
material.