dropper s4

I got my S4 today in the mail!! ;) :chomp: When I opened it ( 100MG/ML) the dropper is labelled only for 0.5 and 1ml.. I wanted to do 50MG per day, and 25AM - 25PM , question is how should I go about measuring the 25MG's.. 1/ Guesstimate? 2/ Take 50MG out and try and save half somewhere else...