My latest twist on being mobile is neither novel, nor unexpected.
People who know me, know that I, years ago, bought an iPad mini. The proclaimed integration of iOS to OS-X "Mavericks" was the trigger. And guess what, I was totally disappointed! The iPad hence ended up being a YouTube watching device only.
Some months ago, I learned about the software Duet Display. Today, finally, I gave myself a push and purchased the iOS app.
Why could my post be any interesting to any photographer?
Lightroom can be set to show a live display on a second screen. Nothing new here either. That second screen could be an iPad, when using Duet Display.
And here comes the interesting bit. Assuming your main computer's screen is color calibrated and the iPad is not, the iPad could provide an impression how a photograph will look when viewed (online) with regular equipment, while the main screen will provide color of the image being printed.
My present dual screen setup is pretty portable: 11in MacBook Air + iPad mini. Probably the smallest available kit for the functionality.