How to recognize good quality vital injector?

No only South Korea, other countries also manufacture vital injector.
What is the different?
Firstly South Korea is the first country where developed the vital injector, their movement and vacuum technique do not public.
Other countries engineer make similar machine use in same area, use different movement
So the injection accurate and stability different.
On the other hand, following engineer copy the working pricinple but the technique can;t be copy.
Outside design technique can;t be copied.
Currently the vital injector 2 all made in South Korea, other places without this skill to make same machine.

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