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A many others have said... getawair.com seems to have different monitors for this. DHH swears by them. They also just look better imo. More comprehensive - https://www.amazon.com/Awair-2nd-Invisible-Quality-Chemicals/dp/B07F282LF4 https://www.amazon.com/Awair-2nd-Invisible-Quality-Chemicals... Cheaper (smart plug version) - https://www.amazon.com/Awair-Glow-Breathe-Quality-Monitor/dp/B06ZXY8ZQZ/ https://www.amazon.com/Awair-Glow-Breathe-Quality-Monitor/dp...