Well I got myself all glass bottles with the same slow droppers ... It takes 5 seconds or so before the first drop and then 2 seconds per other drop ... I stopped using syringes. I just fill up a cylinder up to 10ml and add my drops. I do have precision syringes at home, but when I am testing out stuff ... I never use a syringe : drop -> shake -> test -> repeat cycle if needed.
Let's say you have made 10ml and have created an uber
juice ... You need 3 drop of A,
2 drops of B, 2 drops of C. Now you want to make 30 ml ... so you would say 9 - 4 - 4 ... This might not always be correct, since some flavoring might be more dominant if you use more of it. But in general it works out. Now using drops might not work on very smal test batches when your flavoring is highly concentrated. But if you need less then a drop, you measurements will need to be precise also. I certainly am not the DIY expert, but this is the way how I do it, and it works for me. That's the most important
For certain stuff you will only need like 1 drop 5ml/10ml, like for instance I do use
vape wizard, but for me 1 drop in 10ml is enough. I never measured the 1 drop .. It's just 1 drop
Now for the fun of it. I did test 2-3 different flavormakers from my dropper bottles and let it drop in a 2ml syringe, to test how many drops I would have needed for 1 ml. And they all evened out at the same number of drops