Buy an iPad or iPad mini and install Goodreader (the latest version at this time is actually called GoodReader 4 , according to the previous link; it can be found here )
.That is the best choice.
ebooks.stackexchange.com/users/1190/Jack Kuo
You're trying to find something out of both worlds - tablets and eReaders.
There are serveral devices planned to publish within the coming year.
But at the moment this market looks rather abandonned.
(planned devices by Sony and Onyx as far as I know) Until those devices are on the market you need to limit your requirements, as visibility and readability in sunlight of todays tablets is not that great.
While e-ink displays are nice to read in
nearly every light are still limited to classic ereaders which don't allow full featured pdf view.
ebooks.stackexchange.com/users/1202/Daniel
Print it with a good printer.
I know this is not the answer you are looking for
but it's still the solution that beats current technology.
You can't zoom a print; I'd argue that a good print is sufficient since an scientific article should only have images that have value on A4/Letter paper.
ebooks.stackexchange.com/users/500/Raphael
The Kindle DX, which uses e-ink (so it is readable in direct sunlight), was specifically designed to render PDF files in their native format (including multi-column material, tables and graphics) and was designed to be used in an academic environment.
It has a 9.7" e-ink screen, which I believe is the largest of any e-reader (the Kindle Fire HD has a 7" screen, and does not use e-ink).
You can also zoom in to 200% of the original text.
It is available through Amazon for $300 .
It includes a full keyboard, 3G free "whispernet" connection for downloads, runs up to three weeks on a battery charge with the wireless off, and is one of the thinnest e-readers out there (1/3 inch).
It also includes an accelerometer to sense when you rotate it, to allow a PDF to be read a half page at a time in landscape mode with much larger type.
ebooks.stackexchange.com/users/67/tcrosley
If you want to be able to read anything on a device in a direct sunlight your only choice is an ereader using electronic ink.
Here is an example, outdoors on a sunny day with the sun blasting directly at the screen (try that with a tablet or your phone): From my own experience 9.7" screen size is the minimum you need to read technical literature.
I tried with 8" hi-res screen but it was just too small.
I made an almost complete switch from paper to the ereader
and I read books mainly in the PDF format from sources such as Manning , O'Reilly , Packt , Safari and books that I couldn't find anywhere and scanned myself.
You have quite a choice these days.
In 2012 I started to use bespoke Linux based Onyx Boox M92
and then in 2014 upgraded to Android based Onyx Boox M96 , both 9.7" electronic ink ereaders.
At present there are newer N96 (dual touch) and N96ML
(touch + frontlight) 9.7
" Android devices and 13.3" Onyx Boox Max .
There is also 13.3" Sony DPT-S1
but it runs custom Linux (limited software choice).
You don't list these as requirements but there are some things of secondary importance after the screen that still quite matter to me in the reader I have: very long battery life since the screen doesn't use it once the page is displayed ability to install Android apps (dictionary, cloud client, VPN client etc.)
connectivity (wifi, bluetooth) external storage (microSD cards) and finally ability to scribble/highlight/erase as I would do in a normal book.
One potential disadvantage of ereaders - they are not very powerful.
This can be an issue especially with scanned documents when turning a page can take up to 3 seconds (depending on resolution, complexity, etc.), which renders skimming through such documents impossible.
Below is an example screenshot from my ereader with a table and some doodles, you can zoom in the document as much as you like:
You can find loads of information on ereaders on MobileRead forums .
ebooks.stackexchange.com/users/6663/Johnny Baloney
I need to buy a device for reading. It must have all these features:   Smoothly zoom  all  pictures  Format  all  tables properly  Read PDF (or be able to convert)  Not create eye problems and be visible in the sun   Is there a category of devices that is able to meet all these demands? What is the best size?
What 's the best way to read a scientific PDF?
ebooks.stackexchange.com
<ebook-readers><feature-comparison>
ebooks.stackexchange.com/questions/1279
ebooks.stackexchange.com/users/1173/Delayer
Try an iPad with Goodreader installed or a Kindle DX that has e-ink for sunlight. The answer to this question will be subjective. Some may recommend an iPad with Goodreader installed, others may recommend a Kindle DX or other e-reader that uses electronic ink.
The answer to this question will be subjective. Some may recommend an iPad with Goodreader installed, others may recommend a Kindle DX or other e-reader that uses electronic ink.