Honestly, if I understand you correctly, that's not good enough for mixing. You want a scale that measures 1/100 of a gram (and I'm not going to get into what precision and accuracy mean here.) A scale that reads in tenths of grams is only useful for large batches.
You should mix however you prefer to, but it is my opinion that most new mixers will be far better off mixing by weight than by volume. It's more accurate, more repeatable, and requires much less equipment and clean-up.
I just checked and my scale does weight 1/100's. I haven't used it in a while since I usually use it to weight meat. I used to use it to weigh juice until I came up with the way I do it now. I have a concentrate and I just suck up the concentrate into a syringe, squirt it in the bottle then fill the rest up with VG. I don't know how much cleanup there is to that since there is none with the way I do it. The only equipment that I use is a single syringe so there is less cleanup with the way I do it. Can't get much more repeatable with my method. Can't get much more precise either.
With new mixers, they should do it the way the feel more comfortable mixing wether it be by weight or volume. I started off by weight and ended by volume.
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