I weighed about 10 Babolat Pure Drive 2012 rackets on my scale and got a +-8gram difference between them. I weighed about 7 different Head YT IG Prestige Mid's and the tolerance was much better, +-4grams if I remember correctly. It happens though, and its not cause they are made in China. I had a MIJ Yonex where the balance was off noticeably.
Throughout your life advance daily, becoming more skillful than yesterday, more skillful than today. This is never-ending. - Hagakure