They don't actually know. Apparently there is a floating chip in some and when it reaches the bottom ,or a point towards the bottom, it signals the printer that ink is low. Others have a page printer counter but a page could contain two line of be full of text so it could not accurately know how much ink was left. There usually is 20% of the ink left when it says ink low and not empty at all so I always wait until it no longer prints properly then change it.How does a printer know when its out of ink?
well the printer don't know
it will take paper to print
the output will be blank paper
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