Not bad for measuring completely unknown chemicals. It tests for over 20,000 chemical and combinations of those chemicals.
It's unlike a Valimed where you tell the machine what you're validating and looks up the signature and it either validates it or not. The FIRST DEFENDER scans COMPLETE UNKNOWS. It's in a league of its own.
But that's not the instrument that you shoulds be comparing with the G4. They have one for drugs. I forget the name, look it up.
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