that little bit that stays in the syringe is actually not counted towards the 1ml you are drawing. this is the reason why some manufacturers end up having their multi use vials seem to be underfilled when in reality they may hold exactly 10ml. if you draw out 10 seperate dosages of 1ml from the vial, each dosage will leave slightly less that 1/10th of a ml in the syringe so after 9 draws you will not be able to get much out for your 10th injection. best way to measure the waste is to pull back on the lpunger after your done injectiong and have pulled the pin out of your body and measure what line it goes to.