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Disclosure: Clever Supplies sells compatible cartridges for all of these brands — which is exactly why we'd rather you buy the right number the first time than the wrong one twice. HP, Brother, Canon, Lexmark, Kyocera, Ricoh — every brand runs its own numbering system, and none of them explain it on the box. This is the complete decoder: how each brand names its cartridges, what the letters and numbers mean, and how to never buy the wrong one. The universal rule (all brands) Every ca

Disclosure: Clever Supplies sells compatible Brother cartridges — which is exactly why we'd rather you buy the right number the first time than the wrong one twice. Brother's cartridge numbering looks random until you learn the system — then it reads like a spec sheet. This guide decodes every Brother toner and drum code you're likely to encounter, so you buy the right cartridge the first time. The two-letter system: TN vs. DR Every Brother laser consumable starts with two letters: