JS_Harris - 11:43 pm on Aug 12, 2013 (gmt 0)
I'm still not exactly clear about the initial setup and about how your site happens to be on the list of sites this browser test site is checking.
I did not check my own site, someone else checked my site (repeatedly over four weeks and counting now). It's browser based and so anyone can type in any url to check.
I came to the 500,000 figure because every 'check' results in 100+ bot hits to the url and the site keeps track of recent checks. Looking at that page, and refreshing it, you can see that the site is running this check on 200+ urls per hour, which is near 5000 pages checked a day. 5000 pages x 100 hits each = 500,000 bot hits daily... and this is just one public instal of this script.
If just 20 sites are running this Google Code script, and each checking just 5000 urls per day, you're looking at 10 million bot hits. Since the traffic appears legitimate I would be surprised if some people aren't running this script privately to pad their numbers, perhaps on a site they wish to sell and so want traffic stats boosted a bit.