1. because I have already been caught out once due to poorly specified product features: This all-in-one printer can scan duplex, right?
In other words, it can scan both sides of A4 paper "without" me having to turn the paper over or put it in the paper feed a second time. In other words, I could scan a stack of 20 sheets of paper printed on both sides without any additional intervention and get 40 PDF pages ;-)

2) I understand that all "OfficeJet Pro 912*" products are identical, just sold in different regions of the world. So it would be logical to buy the cheapest one within this series, which is probably the "OfficeJet Pro 9120".

Question

1. because I have already been caught out once due to poorly specified product features: This all-in-one printer can scan duplex, right? 
In other words, it can scan both sides of A4 paper "without" me having to turn the paper over or put it in the paper feed a second time. In other words, I could scan a stack of 20 sheets of paper printed on both sides without any additional intervention and get 40 PDF pages ;-)

2) I understand that all "OfficeJet Pro 912*" products are identical, just sold in different regions of the world. So it would be logical to buy the cheapest one within this series, which is probably the "OfficeJet Pro 9120".

Accepted Answer

Re 1: Yes, you can. I have just tried it again on the document feeder of the recently purchased 9120e. 
Use the "HP smart" app on the computer and tick "double-sided document feeder". This will give you a 2X page PDF from your X-page A4 stack of paper as desired.

Have fun!

Answer

1 yes you can sanction 2 pages in the same sheet directly either from the insertion side of the page or on the glass by turning the page and confirming the second scan but you have to change the scanning system in the settings

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