The phrase "inch device" refers to the size or measurement of a device, specifically in inches. It indicates how big or small the screen or dimensions of a device, such as a smartphone, tablet, or television, are. Full definition
While its screen is surrounded by small bezels, it is still a 5 - inch device with capacitive buttons at the bottom adding even more height. (androidcentral.com)
One of the ways this e-reader is superior to most other six inch devices in its class is the way it handles PDF files. (goodereader.com)
There's also an alleged 8 inch device coming, but no specs here. (tablet-news.com)