HP's Instant Ink subscription service has proven to be incredibly controversial, but does it actually offer value for users ...

After researching 100 ink cartridges across some of the best printer brands, I discovered a shocking fact: the HP 65 Tri-Colour ink cartridge is one of the most expensive inks in the world ...

This allows is to fit flush between the cartridge and HP inkjet printer, intercepting traffic and presumably telling the printer some sweet lies so that you can go on with that print job rather ...

Alan Truly / Digital Trends HP gave the Envy 6155e a feature that helps greatly with a printer with fairly small cartridges — the screen shows estimated ink levels left after each print.