Here's a list of digital devices that are commonly used for reading books in PDF format:

Smartphones: Both Android and iOS smartphones can easily handle PDF files with various reader apps available.

Tablets: Like smartphones, tablets (such as iPads and Android tablets) offer a larger screen for a more comfortable reading experience.

E-readers: Some e-readers like certain models of Kindle, Kobo, and Nook support PDF files, though e-readers are generally better suited for formats like ePub.

Laptops and Desktop Computers: Any laptop or desktop computer can open PDF files, offering a versatile reading experience with the ability to take notes.

Convertible 2-in-1 PCs: Devices that function as both a laptop and a tablet offer flexibility for reading PDFs.

Chromebooks: These devices operate using Google's Chrome OS and can open PDF files for reading.

Netbooks: Smaller and more portable than traditional laptops, netbooks can be used for reading PDFs.

Each device offers its own set of advantages for PDF reading, from portability to screen size and interactive features.