Question about HP Color LJ Pro MFP 3302fdw

Is duplex scanning one pass (as in the HP4302) or two passes?

Yes, with manual feed, where the highest resolution is not possible, but both sides are scanned simultaneously in one pass.

Yes, also in batches. But not in full resolution. In addition, the scan is always a little crooked for me. It's always good enough for a PDF archive.

No, the feeder only scans on one side.

Yes

Not yet tested