The<unk>  (GDD) is a method and apparatus for the<unk>  of signals in the<unk>  environment of an environmental scanning electron microscope (ESEM) and all scanned beam type of instruments that allow a minimum gas pressure for the detector to operate.
Gaseous detection device
Carbon monoxide detector
Respiratory pressure meter
Respirometer
Spirometer
Hyperoxia test
CO-oximeter
Multiple inert gas elimination technique