What you need is an Android device, a USB cable, a developer machine, and the latest version of Google Chrome or Chrome Canary.
First off, we need to activate the Development Mode on our Android device. The process may be different from device to device.
Go to your device’s settings and tap on About Device menu item. Then tap on Build Number seven times. This way you activate the Developer options menu you’ll be able to access in your device’s settings.
Open the new Developer options screen and tap on Allow USB debugging.
Now open Chrome (or Chrome Canary) on your desktop and go to chrome://inspect. Open the page you want to analyze on your Android device and connect it to your desktop via USB. Confirm that you want to allow USB debugging.
Now go back to Google Chrome on your desktop. Here you’ll find a list of all attached devices and the corresponding Chrome tabs.
You can inspect, focus, reload and close any of the available tabs. Furthermore, you can open new tabs adding a URL in the text box on top.
Now, you can run the Developer Tools and inspect any page in the list.
You may also watch these two videos: