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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 bhouston on Friday January 25, 2019 @01:22PM (#19000723)
I always check aliexpress.com https://www.aliexpress.com/wholesale?SearchText=co2+sensor+m...
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