I recorded a screencast providing a comprehensive overview of Edge Inspect.
Watch it here:
Edge Inspect is a new synchronized browsing, previewing, and remote inspection tool for designers, developers, and testers. You “drive” from Google Chrome on your computer, and all the connected devices follow along, allowing you to effortlessly preview a site or an application on multiple devices. If you identify a problem on a specific device, you can remotely inspect the application running on that device using the familiar Google Developer Tools interface on your computer: You can remotely view and manipulate the DOM, access the web resources, and even use the console to interact with the site running on the remote device.
You can find more information about Edge Inspect and the other Edge tools here.