You must have 

1. USB cable (and possibly the drivers for your mobile device already installed on your computer )

2. Android Device (Phone)

3. PC (Windows 10) 

4. Chrome browser on your PC

5. Chrome mobile browser on your Android Device

STEPS to do

Don’t see the developer options? 

A. Enable developers mode on your mobile device (Go to: settings>About Phone - >Software Information - >Build number (tap on this string 8 times). A developers mode will be Enabled.

B. Go to Developers options >Toggle ON USB debugging mode (to ON)

C. Plug in USB cable to your device

D. Allow USB debugging - tapping on OK    The device is now authorized and ready to go! The Chrome developer tools should now list your device name and type.

E.  Open in Chrome mobile browser on your device (phone) for ex www.Google.com

F. Open Chrome browser on your PC (Windows) Find your mobile device using Chrome 

G. Press Shift+Ctrl+i  or just enter chrome://inspect/#devices  in address bar of the browser (you will go to  DevTools) or press More tools - >Developer Tools -> Again More Tools - > Remote devices and then click on the link chrome://inspect/#devices  

H. Press Inspect below link to observe remote browser (a browser on your android device). Chrome browser must be launched with web page opened.

P.S: If you have some problems with your android devise to be detected by your Chrome browser in DEV TOOLS  try to run some COMMANDS in promt line (command line)

enter adb kill-server  

then enter adb start-server 

https://appletoolbox.com/use-web-inspector-debug-mobile-safari/     Debugging Safari app in iOS