Canon PIXMA Photo All-in-One Printers MG2120, MG2220, MG3120, MG3122,MG3220,MG3222, MG3520, MG4120, MG4220; PIXMA Office All-In-One MX372, MX392, MX432, MX439, MX452, MX472, MX512, MX522, MX532 (CL-241) - Inkjet Cartridge, Color Ink Monitoring Technology