The HP DeskJet 3420 uses two ink cartridges: black HP 27 (C8727AN), rated at about 220 pages, and tri-color HP 28 (C8728AN), rated at about 190 pages. Both are standard-capacity remanufactured ink. The same supplies also fit the DeskJet 3320, DeskJet 3322, and DeskJet 3425. Same-day shipping on most orders.
