I can think of three types of portables that meet your requirements: e-ink e-readers, tablets, and laptops. As a rule of thumb, small screens render PDF documents badly.
e-ink e-readers:
I have tested an old Kobo e-reader with Calibre to load the documents from a PC. Mine was a small model that didn't render well, but modern 8" models render better. With Calibre and a cable the device never needs to connect to a network.
Supposedly newer Kindle e-readers can handle PDFs, but I have not tested them. Calibre supports sending documents to them.
There are other e-ink ereaders out there, but I've had no exposure to them. Calibre supports many of them.
tablets:
Tablet form factor PCs frequently have USB ports. Since you already use Windows there won't be a learning curve. Excellent PDF reader support. These are hard to find on the refurb market.
Android tablets and iPads are not a good fit for your needs. They can be made to work without the internet, but don't generally have simple USB stick support.
laptops: The other portable option are laptop PCs. Virtually every device in this class will have USB ports, and all will have PDF document reader options and word processing software. Many options in the refurb market.
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branchandroot
Portable devices I have known...
Date: 2021-11-14 03:10 am (UTC)e-ink e-readers:
I have tested an old Kobo e-reader with Calibre to load the documents from a PC. Mine was a small model that didn't render well, but modern 8" models render better. With Calibre and a cable the device never needs to connect to a network.
Supposedly newer Kindle e-readers can handle PDFs, but I have not tested them. Calibre supports sending documents to them.
There are other e-ink ereaders out there, but I've had no exposure to them. Calibre supports many of them.
tablets:
Tablet form factor PCs frequently have USB ports. Since you already use Windows there won't be a learning curve. Excellent PDF reader support. These are hard to find on the refurb market.
Android tablets and iPads are not a good fit for your needs. They can be made to work without the internet, but don't generally have simple USB stick support.
laptops:
The other portable option are laptop PCs. Virtually every device in this class will have USB ports, and all will have PDF document reader options and word processing software. Many options in the refurb market.