The HP 940XL is an ink cartridge made by Hewlett Packard that fits in a range of HP OfficeJet Pro printers. The ink cartridges can be purchased online or, if you’re looking to save money, you can refill the cartridge with an ink refilling kit. HP 940XL ink cartridges have an electronic chip with an expiration date, which is also usually printed on the ink cartridge packaging. If you attempt to use the cartridge past the expiration date, it will not work, even when full of ink. Fortunately, you can refill and use the cartridge dozens of times before the expiration date.
