Hope that helps .. its a great tool for your bookmarks so you dont get caught out.
It can be very easy to spoof site PR to lure unsuspecting buyers to purchase a domain or anchor text links on a site.
So it is always worth checking the validity of PR. Spoofing the PR is achieved when offending domain name uses a 301 or 302 redirects that point their sites to sites with a high Pagerank.
This tool shows you the true .. site with the PR if it is fake or verifys it for you.