I just started spectral a few days ago. The first time I used it I went w/ the provided sprayer attachment. Didn't like it. Difficult to gauge exactly how much you're really using.
Because I make a lot of my own home-brew concoctions - I got into the habit of cleaning and saving all of my old minoxidil bottles and dropper tops.
Turns out that the droppers that Dr. Lee provides w/ his minoxidil fits perfectly onto the spectral dnc bottles. Now I know I'm getting exactly 1 ml applications.
I didn't transfer the contents into a new bottle (didn't read anywhere where you're supposed to) but I lost the sprayer and screwed on a dropper.
Much easier. You''d think they'd provide a dropper top in addition to or instead of that sprayer top.