How to judge different vital injector?

China market makes all people confuse, only 4 factories manufacture vital injector in South Korea

-- ADDSUNZC ( 5 needle )
-- ADDSUN
-- Derma Queen ( 9 needle)
-- Haifeel ( work drum, one needle )
The main different is the Vacuum and Deepth controller, it control injection accurate and effect.
Vacuum lifting skin layer during injection to avoid facial hurt, keep it without dose sweeping and face bleeding.


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