You may search on the web about how to test ads without generating impressions and you’ll find that adding google_adtest=”on” in your ads will let you load ads without worry about impressions. The problem is that the info that suggest using  google_adtest is too old.

The truth seems to be that this feature is no longer available. I found that in Google Support Forum HERE.

Also, google_adtest cannot be found in the Adsense Documentation.

I prevent not to take risks with using google_adtest attribute, that’s why when I test my website locally I use Server Side Comment.

especially if you are addicted to check your AdSense Account every hour

AdSensor allows you to watch your revenues and statistic directly on your Desktop. It’s also compatible with Windows Vista. All you need to do, after install is to enter your username and password.

You can download the gadget HERE.