Hitachi DT3130E User Manual page 20

CONTRAST
Adjusts the contrast
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CONTRAST Adjushent Screen
Pressing the A button increases contrast, pressing the T button decreases contrast.
(The factory default value is -1 on a scale from -12to+13.) Holding the A or T
buttons for more than one second will cause the value to continue to increase or
decrease.
Pressing the BACK button returns to the MENU.
Pressing the MENU button returns to the original display.
The SELECT button is not active.
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