When i squeeze all of the air out of the little rubber top on the dropper and suck up as much fluid as i can I get .70 ml. It didn't seem to accurate for me to try to get .5ml. I found a 1 ml. syringe without a needle that has marks at every .10 ml that allows me to measure much more acurately. Especialy if you have to break it up into other amounts if you are using nol or clom or clen.