The original Air Display is a great way to add a temporary second screen to any laptop or desktop Macintosh. It’s also super easy to set up and use, as we told you in an iOS tip a while back.
Unfortunately, it’s also a bit on the spendy side. While $10 really isn’t that much to spend for quality software that lets your Mac use an iPad as a second monitor, some folks might not want to spend that much without giving it a good try first.