Patrice,Where on his fingers does he prick? Does he do it on the print?
In my case, I usually have the most success pricking my finger on either side of the finger. Half way between the print and the nail, and half way to between the tip and first knuckle below the nail. I also find this to be the least painful areas. My meter like many newer meters today allow for alternative site testing such as the forearms, but I prefer the fingers.