I have a HP Deskjet 3550 printer i want to know how to check how much ink it has left?

open the HP Director, click on Settings and move the mouse to Print Settings -%26gt; Printer Toolbox (then left click). A new window opens ';HP xyz series Toolbox'; with a Tab ';Estimated Ink Level'; there it shows you more or less accurate how much ink is left in the cartridges.

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