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A comment on Show HN: Low cost CO₂ monitoring (your office) with Prometheus and Go. Parent comment

Re:Show HN: Low cost CO₂ monitoring (your office) with Prome... by ThePadawan on Sunday January 21, 2018 @09:12AM (#16198098)
Another random google link says it could be as little as four shoulder-height areca palms: http://www.secrets-of-longevity-in-humans.com/oxygen-produci...
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