Reddit reviews Portable Oxygen Concentration Content Tester Meter Detector O2 Oxygen Measuring Instrument 0-100% AP-100A
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> All oxygen sensors I've worked with have required a 2 point calibration to be accurate.
Have you worked with the electrochemical cell type of sensors? My understanding was that it was a chemical reaction that required oxygen, so 0 oxygen would be represented by no output. Don't take this as questioning what you said, I'm more trying to understand this myself and confirm my understanding.
The thing that's throwing me is that something like this device for example
Calibration seems to be based on just dialing it in to expected atmospheric oxygen levels, and that is using this exact same sensor.
Perhaps the two point calibration is required only when you need a greater accuracy?