May I ask what electronic devices can read the PDF-format? Only e-books? Which screen would be better for e-books that didn't hurt the eyes?

There were many electronic devices that could read e-books in the PDF-format, such as e-book readers, tablets, smart phones, and laptops. Some of the electronic products could also support the annotation, editing, and conversion functions of the PDF-based e-books, making reading more convenient and faster.

Some hand-held electronic devices can read e-books in the PDF-format, such as: 1. Smart phones: Many smart phones support the PDF-reading function, such as the iPhone and Android smart phones. You can use third-party applications such as the Adobe Acrobat Reader or iBooks to open and read the PDF-files. 2. Tablets: Some tablets also support the ability to read PDF-files, such as the iPad and tablets produced by tablet manufacturers such as Apple and Microsoft2. 3. E-book readers: Some e-book readers such as the iPhone and EPUB readers can also read PDF-files. These devices were usually more suitable for reading various types of e-books rather than PDF-files. 4. Paper books: If you want to read a paper book in the PDF-format, you can buy an electronic publication with a PDF-reading function, such as a library catalog or an online book.

In the past, there were indeed many hand-held electronic devices that could read e-books in PDF-format, such as smart phones, tablets, and e-book readers. But as time went on, the functions of reading PDFs on these devices gradually became more powerful and cheaper. Now, some hand-held devices can already provide PDF-reading functions, such as Google Play Books, Amazon's iPhone Store, and Apple's iPhone Store. In addition, there were also some specialized PDF-readers that were designed specifically for reading e-books in the PDF-format. These devices usually have more powerful reading capabilities and higher resolution, as well as support other types of e-book format. For example, some PDF-readers also supported converting PDF-files into text files for reading on the computer. A hand-held device was a convenient choice for reading e-books in PDF-format, but the specific type of device needed depended on personal preferences, usage needs, budget, and other factors.

The tablet could read e-books in the PDF-format. PDF-A is an electronic document format commonly used for creating, editing, and printing documents. Many tablets support the ability to read PDF-files, such as the iPad, iPhone, Android tablets, and most e-book readers. You can use the built-in reading software on the tablet or a third-party application to open and read the PDF-based e-book.

The Hanwang e-book could read documents in the PDF-format. PDF-A is an electronic document format commonly used to protect the content of documents and can be read on different devices, including Hanwang e-paper books. Hanwang e-book could read the PDF-files through the built-in PDF-reader and could also install the PDF-reader through third-party applications to read the PDF-files on a wider range of devices.

Many e-book stores offer genuine e-books in the PDF-format. Here are some common purchasing channels: 1. Amazon's e-book store: Amazon's e-book store is one of the most popular e-book stores, providing a wealth of genuine e-book resources in the form of PDF-s. You can search and buy it on Amazon. 2. Jian Shu: Jian Shu was a popular online literature platform that also provided a large number of e-book resources in the format of PDF. He could search and purchase them in the book. 3. Douban Reading: Douban Reading is an e-book platform on Douban that provides a large number of genuine e-book resources in the format of PDF. You can search and buy it on Douban. 4. Other online e-book stores: e-books stores such as iBooks, Google Play Books, and Barney & Noble also provide a large number of legitimate e-book resources in the form of PDF-s that can be searched and purchased in these stores. Please note that there is a certain fee for purchasing an e-book in genuine PDF-format. It is recommended to carefully compare the price and resources before purchasing and choose a reliable purchase channel.

Something with a small screen that could only read e-books was often called an "e-book reader" or "e-book tablet." They usually have smaller screens such as 4 inches, 6 inches, etc., but can display a large number of e-book documents and can read various types of e-books, including traditional paper books, e-magazines, news articles, etc. These e-book readers usually also support functions such as reading PDF-documents and downloading Android applications.

There are many reasons why you might prefer physical books to electronic books on the screen. Physical books had a unique aesthetic value. The e-book looked brighter, clearer, and more beautiful on the screen. But physical books have a unique touch and smell that can give you a unique reading experience. Physical books can better adapt to your reading habits. If you read the same type of books often, physical books can help you find the information you need more easily. Besides, if you're reading somewhere, a physical book will make it easier for you to stay focused and focused. Finally, some physical books might be cheaper. Although e-books are very cheap in the digital market, they may be more expensive than paper books in the physical market. Therefore, for some people, buying physical books might be more economical. Of course, these were just some possible reasons. Everyone's preferences and habits were different. If you don't like the e-book on the screen, you can try other types of reading experiences such as the reader app or audio books.

Harry Potter books 1-7 in English, in PDF-format, I'm ready. Please tell me which version of Harry Potter you need and how many you need.

In the past, some electronic devices were thought to only be able to read e-books, such as the Kindle and eReader. However, as time went on, more and more electronic products were developed that could read and support e-books in multiple format at the same time, such as Android and iPhone devices, tablets, and smart phones. With the development of technology, the format of e-books is constantly updated and evolved. Some e-book format is no longer widely used. Therefore, even an electronic product that could only read e-books could gradually be eliminated in the future.