The Front Panel will tell you when your ink supply is low, very low or empty. This means you know current status of
your HP Ink Supplies all the time:

NOTE:

Depending on type of print jobs, a cartridge with a Low Ink Warning may in
fact last quite a long time (for example, with line drawings).

NOTE:

The Ink Cartridges levels information can also be selected with
Ink menu > Information > Ink Cartridges > Ink Levels if it is not automatically
shown in the Ink menu.

Cartridge
Full

Low Ink
Warning

Cartridge
Empty