Jackie_w has it
My TAB 2 came with a PDF viewer that works fine. (I use PDF for technical files. Diagrams, color and that sort
)
There is the FREE Amazon ap in the Google play store
I use Moon+ (YMMV)
and of coarse, Calibre Companion since I already manage my Library with Calibre.
BTW Outdoors (even shady) during the day...
Even with the brightness maxed (that eats battery time
)