The issue is sometimes theres air in it or it doesnt fill all the way. Ex would be plunger at 4 but product at filled from 4to1 leaving 1ml empty . SO I push it back up and then start again but the tube then has the product covering the sides. How do I know I am getting proper dose?
I dont see how I could be doing it wrong but what is the proper way. I shake the bottle ,push dosing container in and pull plunger