1. North America results based on 2018 SpencerLab Color and 2019 SpencerLab Monochrome Reliability studies for North America, both commissioned by HP. Color study compared Original HP color cartridges with six brands of non-HP cartridges for the HP LaserJet Pro color 400 M451dn; CE410A/X, CE411A/412A/413A cartridges. See spencerlab.com/reports/HP-CLR-Reliability-NA-2018.pdf. Monochrome study compared Original HP cartridges with seven brands of non-HP cartridges for the HP LaserJet Pro M402 and Pro M521 printers; HP 26A and 55A cartridges. See spencerlab.com/reports/HPReliability-NA-2019.pdf.
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