What is the refurbished machine regarding vital injector

It is not a taboo topic in China, some vital injector we call a refurbished machine.
since vital injector publish already a few years, especially the 1st generation vital injector from Eunsung.
Some supplier collect the old vital injector from some end users, if machine with problem then fix it. Then replace a new shelf.
The appearance and function will be totally like new machine but selling in old machine, some company doing project will use it.
Mostly no one selling it to customers but can not avoid someone get profit by it.
If Eunsung model vital injector selling price much lower than normal price should do some compare and avoid this problem
Currently without ways to identify it through appearance, only after some period use could know it from vacuum system and machine runing.

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