Yup, no markings oh the pipet. I always just let the pipet fill up by squeezing the teet end fully once and just administer that amount. If you are wanting more of a longer lasting effect than have two! I did measure it out a few years back to see how much it was but for the life of me cant remeber now!! One pipet serving might, and that is a might, be 5ml i think. Have fun!