Adsense Sandbox is a 3rd party tool that gives you a preview of Google ads that will appear on any given website, based on the visitor’s geo-location, i.e. a visitor from the U.S. will see a different ad than a visitor from Singapore. What’s more interesting is that it shows the different ad formats, i.e. from ad units to link units to banners and video ads. The tool uses random Adsense publisher IDs, likely to prevent the owner getting banned from invalid clicks.
