Our discount compatible HP DeskJet 6840dt ink cartridges will print with the same consistency and reliability as your original HP printer cartridge. Whether you are producing high-resolution images or a professional-looking resume, trust our ink cartridges to get the job done. All of our ink cartridges for HP DeskJet 6840dt printers are tried and tested with a quality control review that ensures they will work with your printer to create high-quality documents and images. Our comprehensive 1-Year warranty and 100% customer satisfaction guarantee provide our customer with complete peace of mind. The warranty encompasses all aspects of the cartridge including page yield and print quality. Buy with confidence knowing that we stand behind our products.