GE PM880 - Setting the Backlight Timer

Chapter 3. Using the PM880 Screen
40 Model PM880 Portable Hygrometer User’s Manual
3.4.2 Setting the Backlight Timer
1. If the menu is not active, press [MENU].
2. Use the arrow key to scroll to Meter and press [ENTER].
3. Use the arrow key to scroll to Backlight and press [ENTER].
4. Use the arrow key to scroll to Backlight Off and press [ENTER].
5. Use the numeric keys to enter the number of minutes that the backlight
remains on (from 0 to 60).
6. Press [ENTER] to confirm the entry.
7. When you are done, press [F3] (OK).The PM880 returns to taking
measurements.