Martel Electronics BetaGauge 3II - Manual (Page 60)

4-5 User Preferences
2. Press the function key corresponding to the menu
item LED. The lower portion of the LCD will
appear similar to the example shown below:
3. Use the numbers on the keypad to enter a backlight
display value between 0 and 3600 seconds, then
press the ENTER key to return to the LCD menu.
NOTE: If you attempt to enter a value outside this
range, an Invalid Entry message will
appear.
To erase an existing entry or to correct a
mistake, use the CLR key to erase the character to
the left of the cursor.
4. From the LCD menu, press the CLR key to return
to the Setup menu.
Setting the LCD Contrast
The BetaGauge II is supplied with a variable contrast
display that you can lighten or darken as necessary.
Procedure
To set the display contrast, do the following:
1. Use the Menu key to locate the Setup menu item
LCD, then press the corresponding function key to
display the LCD menu.
2. Press the function key corresponding to the menu
item Contrast. The lower portion of the LCD will
appear similar to the example shown below:
Set backlit time
33 seconds
Adjust Contrast
Light Dark