I did an experiment today on the amount of drops in various measurement lines on a BD 3ml syringe with a 23g 1.5" needle . I did each test 3 times - 1.5ml averaged 182 drops . 1ml averaged 134 drops ; .5ml averaged 61 drops ; .3ml averaged 34 drops ; .2ml averaged 22 drops - based on this if the 1ml line yields 134 drops - then .5 line should be 67 drops -and .25ml should be 33.5 drops .
so the conclusion to my experiment is the number 3 small line is actually .25ml of liquid . Btw I used water for experiment . Another interesting finding was after the plugger reached the bottom , if I pushed hard on it , 3 more drops came out . Another interesting finding was my Watson brand 10ml bottle seemed to be only about 8.5 - 9ml - but this was just doing a rough calculation doing 2 shots per week . Maybe the amount left in the syringe tip accounts for the lower number yielded .