Webmaster Tools, offered by Google, provides a useful indication of how well Google can trawl your website, as well as many other website improvements.
It’s important you setup Webmaster Tools, as it allows you to edit how Google reads your site, such as setting the target country and managing settings for multiple domains. Any errors that are found when trawling your site are emailed to you, enabling you to correct promptly. It’s recommended that you add all domains that are linked to your site so that you can tell Google they are connected to the same website. This prevents duplicated listings, and helps promote a better search ranking overall.