What toner cartridges are compatible with the M402 and M403 models?
M402 models use HP 26A (standard) or 26X (high-yield) cartridges, while M403 models use HP 28A (standard) or 28X (high-yield) cartridges. High-yield cartridges contain more toner than standard cartridges for increased page yield. (Page 28)
From the official HP LaserJet Pro M402 M403 Printer manual, page 28
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