51a toner cardridge refill (Model No. Q7551a)

Hello everyone, In this video i will show you how to refill HP Q7551a (51a) laser toner cartridge.
Q7551A toner cartridge is compatible with the following HP printer models:
LaserJet M3027; LaserJet M3035; LaserJet P3005; LaserJet P3005dn.
Thanks for watching.
#itmakeeasy #tonerrefilling

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how did i know how much ink is required to put in the cardridge