This SEO tools gives you series of test results. Initially it was extension of Google Chrome later google made this a part of the Google Chrome
To access this SEO tool just open your website URL in google chrome. Once the page is gully loaded. Click menu –>> More Tools –>> Developer Tools.
From top menu click the Audit
Once you click Audit you will see Google Audits on the right side will a set of tools. For auditing your website you have two options.i.e Audit of your website for Mobile or desktop devices.
Select you device option and than down check the audit options that you want to do for your website and then click Run Audits button.
Once you click Run Audits button your web page will be refreshed automatically for auditing.
Finally you will get the auditing report of your website.