You can adjust the display contrast for each of the GT-100's display screens. Doing so can help make it easier to view the contents in the display from different angles.

Here's how to adjust the contrast.

1. Press SYSTEM. 

2. Turn knob 4 to highlight the "LCD" icon.

3. Turn knob 5 to adjust the contrast of the left-side display.

4. Turn knob 8 to adjust the contrast of the right-side display. 

5. Press EXIT when you're finished. The new settings are saved automatically.