Outside of the nic base what is needed for hardware
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There are two popular methods for mixing your own
juice, by volume or by weight.
If you mix by volume you will need a beaker or a graduated flask to pour into. Most people who do volume mixing have marker lines on their vessel for nicotine, PG, VG, and flavor. Since flavor and nicotine are small percentages of the mix, most use a tall narrow flask that will actually show small additions by the height of the pour. They also use small pipettes that are graduated for the small millimeter amounts of the ingredients. They add ingredients up to the marked line for that ingredient and go on to the next ingredient. When all ingredients are added, they pour the mix into a bottle. shake it, and set it aside .
If you mix by weight, you need an inexpensive digital scale. 500mg capacity is more than enough and those are available from under $10 to about $35 at Amazon.com. For mixing by weight, you need some bottles, preferably glass, IMO. Glass is heavier and less likely to tip over on the scale. Pipettes and droppers are good for transferring nicotine to the bottle on the scale. For PG and VG most use clear condiment squeeze bottles. Flavors come in dropper bottles and those are fine for adding drops or streams to a bottle on a scale. You add an ingredient, tare to zero, and continue with the next, pouring up to the weight of that ingredient.
I just put the bottle on the scale, tare the scale, and add ingredients one by one, taring to zero after each. When through, I cap it, shake it, and set it aside to steep, and the next bottle goes on the scale. Tare to zero and repeat.
This video teaches the weight method. It's what sold me on mixing by weight.