I just read about this Facebook promo from BitsDuJour on one of our member's blog Thanks!!

I'm been wanting this app for awhile now -- using PicPick for doing this but the ruler is too short most of the time -- but the price was always too high for my budget.

You might want to jump on this one, I did.

BitdDuJour is giving away free serial numbers of Screen Calipers software (MAC and Windows) .... In order to get Screen Calipers software for free, go to BitsDuJour Facebook page and like it. After you like it, the serial number will be given to you
Notes:
  1. This is the latest version (4.0)
  2. On their , you will find a to a number of useful and well-made skins for Calipers as well.