Chapter 4. Using Special Features
Model PM880 Portable Hygrometer User’s Manual 55
4.8 Entering a User Constant
Use the following steps to enter a user constant. The default multiplier is 1.
1. If the menu is not active, press [MENU].
2. Use the arrow key to scroll to Program and press [ENTER].
3. Use the arrow key to scroll to System and press [ENTER]. A screen 
similar to Figure 22 appears.
4. Use the arrow keys to move to the K ï‚´ PPMv text box and press 
[ENTER].
5. Use the numeric keys to enter the desired value and press [ENTER].
Figure 22: System Configuration Window
Next, do one of the following:
• Use the arrow keys to move to another text box and enter additional 
data.
• To exit and return to taking measurements, press [F3] (OK) and then 
[MENU].