I recently ran outta my watson 540s and got some from a family friend only they arent working at all there is no pain relief and seems to make my right arm feel like i have apinched nerve. I looked and even measured them against some others same brand only fron my pharmacy and i cant tell the visual difference. Does anyone know something i shld visually look for that will show/tell me the difference in the real ones oposed to the fake ones? Please help!!!