How Much Ink Is Left in That Dead Cartridge?
You've probably had this experience: Your printer tells you it's time to change the cartridge, but you dismiss the message and keep printing. Days or weeks later, you're still using the same cartridge and thinking to yourself that rumors of its death were greatly exaggerated.
Or perhaps your printer simply shuts down when it decides you've gone deep enough into its ink well, refusing to operate until you replace the cartridge, though you suspect there's plenty of ink left...
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"I know nothing."