Hi. I am thinking of buying one of your pens with the 3 ml vial. Is it something special I need to think of if I would like to fill it with the content from three different 1 ml vials?
I am mixing 1 ml BAC water per vial so I would like to fill the 3 ml pen vial with that total 3 ml content.
Of course I am going to filter each vial.
//Noob