Which toner cartridges are compatible with the M426 and M427 models?
The M426 models use the HP 26A (CF226A) standard-capacity or HP 26X (CF226X) high-yield black toner cartridge. The M427 models use the HP 28A (CF228A) standard-capacity or HP 28X (CF228X) high-yield black toner cartridge. High-yield cartridges contain more toner than standard cartridges for increased page yield. (Page 30)
From the official HP Laserjet Pro Mfp M426 M427 F manual, page 30
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