The file 'Phone & Tablet Support 3D Printer Model' is (stl) file type, size is 218.0KB.
With two of these tablets/phones up to at least 7" can be set to lean at an 67, 44, 27 or 13 degree (approximate) angle on top of this, but limited to landscape orientation. A 10mm thick tablet might not fit (maybe if you file some out of the openings), but anything below that should work.
For portrait orientation you need another pair; two connected ones elongates the horizontal surface.
Two of them can be "folded" in the sense that they can be joined if you reverse one.
70 by 34mm, 10+10mm thick - a folded pair can be kept in a trouser pocket.
Limited testing on this version, the 6 previous versions has been in use for some time.
TabSupport_v7.stl | 2.1MB |