Replacement for Dell 310-3674 - HIGH YIELD (10000 pages) Compatible Black MICR Toner Cartridge for Dell S2500 / S2500n. MICR is an acronym for Magnetic Ink Character Recognition. MICR Cartridges are used for printing checks. Banks read magnetic ink differently than standard ink which allows them to reliably process checks. Magnetic Ink Recognition Toner; Regular toner mixed with IRON OXIDE particles recognized by scanning devises. Mainly used for Check printing and bar coding. Built with NEW drums and NEW components that match all ABA standards (American Bankers Association). The MICR 10 000-Page High Yield Toner for Dell S2500 / S2500n Workgroup Laser Printers (310-3674 MICR) 10 000 Page Yield is also known as 310-3547 R0887 & R0884 MICR's. Replaces 310-3548 310-3546 R0883 & R0886 MICR's.