HP Color LaserJet CP3520 Printer Series - Manual (Page 25)

Usage Page
The Usage Page screen gives a page count for each media size that has passed through the product,
as well as the number of duplexed pages. The total is calculated by multiplying the sum of the print count
values by the Units value.
The information on this screen can be used to determine how much toner or paper to keep on hand.
The following illustration and table describe how to use this screen.
Figure 2-6 Usage Page screen (1 of 3)
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ENWW Usage Page 15