How we got the Page yield for Genuine HP 12A Black Toner
Page yield number is given by our supplier they are tested on A4 paper with 5% ink covered under standard quality mode. The actual page yield varies depending on the quality mode you use, how much ink covered on the page.
Turning the printer on and off or running cleaning cycles will consume ink as well.
Ink page yield might not be exact, even original OEM cartridges will have this issue, If your cartridge did not start fading then you should not worry if the print tell you is out of ink or low ink. We suggest that you can ignore or turn off your ink indicator and continue to print until the print start fading out.