In order to preview their ad, advertisers must be signed into their account which also allows them to see integrated keyword diagnosis results. By setting a specific location for the preview, users can now see how your ads will look to a user in New York even if they are located in San Francisco. Advertisers can also view and analyze their ad visibility on multiple devices without having to borrow all of your friends' phones!

Google's Gordon Zhu announced the news on the Inside AdWords blog, including:

In addition to displaying the ads for that search, the Preview Tool now specifically confirms whether your ad is showing and links to the relevant campaign and ad group. If your ad isn't showing, the Preview Tool will tell you why, helping you understand if you need to adjust your bids, location targeting, daily budget, or optimize your account.

The preview tool will also be very handy for advertisers who want to target their mobile ad campaign to an area other than their current physical location. By entering latitude and longitude information in the Ad Preview Tool, users can promptly verify if their ads are displaying their business address to mobile users properly within a specific geographical location. I have to admit, this is pretty neat!

You can explore these new features by finding the Ad Preview Tool under the Reporting and Tools tab in your AdWords account or by navigating directly to www.google.com/adpreview.