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A comment on Show HN: I wanted to measure CO2 in my office, so I build a C++ WebServer/App. Parent comment

Re:Show HN: I wanted to measure CO2 in my office, so I build... by stackmad on Friday January 25, 2019 @08:43AM (#18997771)
I guess it should match the outside air as close as possible. So around 400ppm
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