If it were pennies and iu I would not care about .5iu, but its gh and it costs a lot of money. I don't know why the hell I cant get that last .5iu out of my draw, I put 1ml in and no matter what I do I cant get a full 1ml back. I put extra air in to pressurize the vial, I make sure the tip of needle is at the very bottom of the other end of the rubber...what am i doing wrong?