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Cartridge comes along with memory, the information of estimated ink/toner levels will stored in this memory(Depends upon the cartridge model yield will varies). When printer performs the printing, memory count will comes down, when its reaches the minimum count printer will display the message of "low ink/toner/remain pages" levels, once its reaches to '0', display will changes like "replace the cartridge"...But there is no electronic component or mechanism to measure the ink/toner levels in the cartridges.Only estimated levels only printer can recognizes.. Take usage page through menu, you will get the information that usage % & printed pages info,you can judge how much remain it can print...