HP Designjet 510 Printer series - Manual (Page 58)

Ink cartridge levels
The front panel will tell you when your ink supply is low, very low or empty. This means that you know the current
status of your HP ink supplies at all times.
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 cartridge level information can also be selected with
Ink menu > Information > Ink Cartridges > Ink Levels if it is not automatically shown in the Ink
menu.
Cartridges
full Low ink
warning
Cartridge
empty