We can use chrome extension so called "Tag Assistant (by Google)"
Tag Assistant helps to troubleshoot installation of various Google tags including Google Analytics, Google Tag Manager and more.
Tag Assistant helps you verify that you have installed various Google tags correctly on your page. Just navigate to any page and Tag Assistant will tell you which tags are present, report any errors we find and suggest improvements that can be made to your implementation. Most Google tags are checked including Google Analytics, Adwords Conversion Tracking, Google Tag Manager and more.