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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 gsich on Friday January 25, 2019 @10:01AM (#18998462)
MH-Z14 or Z19 are cheap, but not 8$ cheap, more like 25.
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